A bitterwood is another term for a quassia - any of several tropic trees of the genus Quassia, with scarlet flowers.
A lot of words. Biannually, biblically, Biblicists, bibliology, bibliopole, bibliothec, bibliotics, bibliotist, bibulously, bicapsular, bichloride, bichromate, bickerings, bicornuate, bicornuous, bicultural, bicyclists, biennially, bifacially, bifurcated, bifurcates, bigamously, bighearted, bigmouthed, bignoniads, bijouterie, bilabially, bilberries, bilestones, bilgewater, bilharzias, bilinguals, bilirubins, biliverdin, billabongs, billboards, billfishes, billiardly, billionths, billowiest, billystick, bilocation, biloculate, bimanually, bimestrial, bimetallic, binaurally, Binghamton, binoculars, binomially, binturongs, binucleate, bioassayed, bioattacks, biochemist, biodefense, biodegrade, biodynamic, bioethical, biogenesis, biogenetic, biographer, biographic, biohazards, biological, biologisms, biologists, biomedical, biometrics, biometries, bionically, bionomical, biophysics, biopolymer, biorhythms, bioscience, biospheres, biotically, bioweapons, bipartisan, bipartizan, bipedalism, bipolarity, biquadrate, biracially, biradially, birchbarks, birdbrains, birdfeeder, birdhouses, birdliming, Birmingham, birthmarks, birthplace, birthrates, birthright, birthroots, birthstone, birthworts, Biscutella, bisections, bisexually, bishophood, bishoprics, bishopries, bispectrum, bistouries, bisulfates, bisulphate, bitartrate, biteplates, bitingness, Bittacidae, bitterness, bitternuts, bitterroot, bitterweed, bitterwood, bitumastic, bitumenoid, bituminize, bituminoid, bituminous, bivouacked, biweeklies,
The prefix 'bi' generally means two or twice. Words that have the prefix 'bi' are:bicoastalbiannualbiannuallybiasbiasedbiasesbiasingbiathlonbiathlonsbicameralbicameralismbicarbbicarbonatebicarbonatesbicarbsbicentenariesbicentenarybicentennialbicentennialsbicepbicepsbicolorbiconcavebiconvexbicuspidbicuspidsbicyclebicycledbicyclerbicyclersbicyclesbicyclingbicyclistbicyclistsbidirectionalbidirectionallybiennialbienniallybiennialsbienniumbienniumsbifocalbifocalsbifunctionalbifurcatebifurcatedbifurcatesbifurcatingbifurcationbifurcationsbilabialbilabialsbilateralbilaterallybilinearbilingualbilingualismbilinguallybilingualsbimetallicbimetallicsbimetallismbimodalbimonthliesbimonthlybinariesbinarybinocularbinocularsbinodalbinomialbionicbionicallybionicsbiopicbiopicsbiopsiedbiopsiesbiopsybipartisanbipartisanshipbipartitebipedbipedalbipedalismbipedsbiplanebiplanesbipodbipolarbipolaritybiracialbisectbisectedbisectingbisectionbisectionsbisectorbisectorsbisectsbisexualbisexualitybisexuallybisexualsbitonalbivalentbivalvebivalvesbiweeklybiyearlybipartisan, bilateral, biracial, bisexual, biped, bicycle, binoculars