The yellow bird is most likely a yellow crowned Kinglet and the other a red crowned kinglet
Interesting. You are the fourth person to ask about this bird that I've seen so far. It is a Northern Flicker, specifically the "Yellow-shafted" morph, nicknamed "Yellowhammer". It is a species of woodpecker.
That bird is called a western goldfinch.
This bird you have been seeing is a blue jay! (If not that it is a white-breasted nuthatch) Happy to help!
The bird you are referring to could be a male Orchard Oriole. It has a bright yellow body with a black chest and wings, and its bill is also black. The Orchard Oriole is similar in size to a Blue Jay.
There are far too many birds like this to identify this bird. You need to describe it in more detail - such as its size and bird type.
Check a field guide for meadowlark, eastern or western.
hoopoe ?
Check your field guide for the eastern meadowlark.
could be ptarmigan
If the black is the crown of the head, and you can notice a patch of red under the tail when it takes off, it is a catbird.
Please give more information- where you saw the bird, what it was doing, country, landscape, size, beak, etc.