turkey vs tom turkey

turkey and tom turkey both are nouns.

Word	Noun	Adjective	Verb	Adverb
turkey	Yes	No	No	No
tom turkey	Yes	No	No	No

As nouns, tom turkey is a hyponym of turkey; that is, tom turkey is a word with a more specific, narrower meaning than turkey:

turkey: large gallinaceous bird with fan-shaped tail; widely domesticated for food
tom turkey: male turkey

Other hyponyms of turkey include gobbler, tom, turkey cock.

turkey (noun)	tom turkey (noun)
large gallinaceous bird with fan-shaped tail; widely domesticated for food	male turkey
an event that fails badly or is totally ineffectual
flesh of large domesticated fowl usually roasted
a person who does something thoughtless or annoying