gem vs solitaire

gem and solitaire both are nouns.

Word	Noun	Adjective	Verb	Adverb
gem	Yes	No	No	No
solitaire	Yes	No	No	No

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

Other hyponyms of gem include crown jewel, diamond, ruby, pearl, emerald, sapphire.

gem (noun)	solitaire (noun)
a precious or semiprecious stone incorporated into a piece of jewelry	a card game played by one person
art highly prized for its beauty or perfection	a dull grey North American thrush noted for its beautiful song
a sweet quick bread baked in a cup-shaped pan	extinct flightless bird related to the dodo
a person who is as brilliant and precious as a piece of jewelry	a gem (usually a diamond) in a setting by itself
a crystalline rock that can be cut and polished for jewelry