oolong vs tea

oolong and tea both are nouns.

Word	Noun	Adjective	Verb	Adverb
oolong	Yes	No	No	No
tea	Yes	No	No	No

As nouns, tea is a hypernym of oolong; that is, tea is a word with a broader meaning than oolong:

oolong: Chinese tea leaves that have been partially fermented before being dried
tea: dried leaves of the tea shrub; used to make tea

Other hypernyms of oolong include tea leaf.

oolong (noun)	tea (noun)
Chinese tea leaves that have been partially fermented before being dried	a beverage made by steeping tea leaves in water
	a light midafternoon meal of tea and sandwiches or cakes
	dried leaves of the tea shrub; used to make tea
	a tropical evergreen shrub or small tree extensively cultivated in e.g. China and Japan and India; source of tea leaves