jewel vs solitaire

jewel and solitaire both are nouns.

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

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

jewel: a precious or semiprecious stone incorporated into a piece of jewelry
solitaire: a gem (usually a diamond) in a setting by itself

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

jewel (noun)	solitaire (noun)
a precious or semiprecious stone incorporated into a piece of jewelry	a card game played by one person
a person who is as brilliant and precious as a piece of jewelry	a dull grey North American thrush noted for its beautiful song
	extinct flightless bird related to the dodo
	a gem (usually a diamond) in a setting by itself

jewel (verb)	solitaire (verb)
adorn or decorate with precious stones