pie vs squash pie

pie and squash pie both are nouns.

Word	Noun	Adjective	Verb	Adverb
pie	Yes	No	No	No
squash pie	Yes	No	No	No

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

pie: dish baked in pastry-lined pan often with a pastry top
squash pie: similar to pumpkin pie but made with winter squash instead of pumpkin

pie (noun)	squash pie (noun)
dish baked in pastry-lined pan often with a pastry top	similar to pumpkin pie but made with winter squash instead of pumpkin