turkey vs hen turkey

turkey and hen turkey both are nouns.

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

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

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