Café, cage, cake, calf, calk, call, calm, came, camp, cane, cape, card, care, cart, case, cash, cast and cave contain 4 letters. Cell, chap, chat, chef, chin, chip, chop, chow, city, clam, clap, claw, clay, clip, clog, club, clue and coal contain 4 letters.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 251 words with the pattern F---. That is, four letter words with 1st letter F. In alphabetical order, they are:

faan

faas

fabs

face

fact

fade

fado

fads

fady

faff

fags

fahs

faik

fail

fain

fair

faix

fake

fall

falx

fame

fand

fane

fang

fank

fano

fans

fard

fare

farl

farm

faro

fars

fart

fash

fast

fate

fats

faun

faur

faut

faux

fava

fave

fawn

faws

fays

faze

feal

fear

feat

feck

feds

feeb

feed

feel

feen

feer

fees

feet

fegs

fehm

fehs

feis

fell

felt

feme

fems

fend

feni

fens

fent

feod

fere

ferm

fern

fess

fest

feta

fete

fets

fett

feud

feus

feys

fiar

fiat

fibs

fice

fico

fido

fids

fief

fier

fife

fifi

figo

figs

fike

fiky

fila

file

fill

film

filo

fils

find

fine

fini

fink

fino

fins

fire

firk

firm

firn

firs

fisc

fish

fisk

fist

fits

fitt

five

fixt

fizz

flab

flag

flak

flam

flan

flap

flat

flaw

flax

flay

flea

fled

flee

fleg

flew

flex

fley

flic

flim

flip

flir

flit

flix

floc

floe

flog

flop

flor

flow

flub

flue

flus

flux

foal

foam

fobs

foci

foen

foes

fogs

fogy

fohn

fohs

foid

foil

foin

fold

folk

fond

fone

fons

font

food

fool

foot

fops

fora

forb

ford

fore

fork

form

fort

foss

foud

foul

four

fous

fowl

foxy

foys

fozy

frab

frae

frag

frap

fras

frat

frau

fray

free

fret

frib

frig

fris

frit

friz

froe

frog

from

fros

frow

frug

fubs

fuci

fuck

fuds

fuel

fuff

fugs

fugu

fuji

full

fume

fums

fumy

fund

fung

funk

funs

furl

furr

furs

fury

fusc

fuse

fuss

fust

futz

fuze

fuzz

fyce

fyke

fyle

fyrd

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 556 words with the pattern -U--. That is, four letter words with 2nd letter U. In alphabetical order, they are:

aufs

auks

aula

auld

aune

aunt

aura

auto

buat

buba

bubo

bubs

bubu

buck

buda

budi

budo

buds

buff

bufo

bugs

buhl

buhr

buik

buke

bulb

bulk

bull

bumf

bump

bums

buna

bund

bung

bunk

bunn

buns

bunt

buoy

bura

burb

burd

burg

burk

burl

burn

burp

burr

burs

bury

bush

busk

buss

bust

busy

bute

buts

butt

buys

buzz

cube

cubs

cuds

cued

cues

cuff

cuif

cuit

cuke

cull

culm

cult

cunt

cups

curb

curd

cure

curf

curl

curn

curr

curs

curt

cush

cusk

cusp

cuss

cute

cuts

duad

dual

duan

duar

dubs

duce

duci

duck

duct

dude

duds

dued

duel

dues

duet

duff

dugs

duit

duka

duke

dule

dull

duly

duma

dumb

dump

dune

dung

dunk

duns

dunt

duos

dupe

dups

dura

dure

durn

duro

durr

dush

dusk

dust

duty

euge

eugh

euks

euoi

euro

fubs

fuci

fuck

fuds

fuel

fuff

fugs

fugu

fuji

full

fume

fums

fumy

fund

fung

funk

funs

furl

furr

furs

fury

fusc

fuse

fuss

fust

futz

fuze

fuzz

guan

guar

gubs

guck

gude

gues

guff

guga

guid

gula

gule

gulf

gull

gulp

guls

guly

gump

gums

gung

gunk

guns

gups

gurl

gurn

gurs

guru

gush

gust

guts

guvs

guys

hubs

huck

hued

huer

hues

huff

huge

hugs

hugy

huhu

huia

huic

huis

hula

hule

hulk

hull

huma

humf

hump

hums

hung

hunh

hunk

huns

hunt

hups

hurl

hurt

hush

husk

huso

huss

huts

iure

juba

jube

juco

judo

juds

judy

juga

jugs

juju

juke

juku

jump

junk

jupe

jura

jure

jury

just

jute

juts

juve

kudo

kudu

kueh

kues

kufi

kuia

kuku

kula

kuna

kune

kuri

kuru

kuta

kuti

kutu

kuzu

luau

lube

luce

luck

lude

ludo

luds

lues

luff

luge

lugs

luit

luke

lull

lulu

luma

lump

lums

luna

lune

lung

lunk

lunt

luny

lure

lurk

lurs

lush

lusk

lust

lute

lutz

luvs

luxe

much

muck

muds

muff

mugg

mugs

muid

muil

muir

mule

mull

mumm

mump

mums

mumu

mung

muni

muns

munt

muon

mura

mure

murk

murl

murr

muse

mush

musk

muso

muss

must

mute

muti

muts

mutt

muzz

nubs

nude

nuff

nuke

null

numb

nuns

nurd

nurl

nurr

nurs

nuts

ouch

ouds

ouks

ould

oulk

ouma

oupa

ouph

oups

ourn

ours

oust

outs

ouzo

pube

pubs

puce

puck

puds

pudu

puer

puff

pugh

pugs

puha

puir

puja

puka

puke

puku

pula

pule

puli

pulk

pull

pulp

puls

pulu

puly

puma

pump

pumy

puna

pung

punk

puns

punt

puny

pupa

pups

pupu

pure

puri

purl

purr

purs

push

puss

puts

putt

putz

puys

quad

quag

quai

quat

quay

quep

quey

quid

quim

quin

quip

quit

quiz

quod

quop

rube

rubs

ruby

ruck

rucs

rudd

rude

ruds

rued

ruer

rues

ruff

ruga

rugs

ruin

rukh

rule

ruly

rume

rump

rums

rund

rune

rung

runs

runt

rurp

ruru

rusa

ruse

rush

rusk

rust

ruth

ruts

suba

subs

such

suck

sudd

suds

sued

suer

sues

suet

sugh

suid

suit

sukh

suks

sulk

sulu

sumo

sump

sums

sumy

sung

sunk

sunn

suns

supe

sups

suqs

sura

surd

sure

surf

suss

susu

tuan

tuba

tube

tubs

tuck

tufa

tuff

tuft

tugs

tuis

tule

tump

tums

tuna

tund

tune

tung

tuns

tuny

tups

turd

turf

turk

turm

turn

tush

tusk

tuts

tutu

tuzz

vugg

vugh

vugs

vuln

vums

wuds

wudu

wull

wuss

yuan

yuca

yuch

yuck

yuft

yuga

yugs

yuke

yuko

yuks

yuky

yule

yump

yunx

yups

yurt

yutz

yuzu

zulu

zupa

zurf