pyrimidine vs thymine

pyrimidine and thymine both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyrimidine	Yes	No	No	No
thymine	Yes	No	No	No

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

pyrimidine: any of several basic compounds derived from pyrimidine
thymine: a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine

Other hyponyms of pyrimidine include C, cytosine, T.

pyrimidine (noun)	thymine (noun)
a heterocyclic organic compound with a penetrating odor	a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine
any of several basic compounds derived from pyrimidine