cyme vs cymule

cyme and cymule both are nouns.

Word	Noun	Adjective	Verb	Adverb
cyme	Yes	No	No	No
cymule	Yes	No	No	No

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

cyme: more or less flat-topped cluster of flowers in which the central or terminal flower opens first
cymule: a small cyme, generally with few flowers

Other hyponyms of cyme include glomerule, scorpioid cyme.

cyme (noun)	cymule (noun)
more or less flat-topped cluster of flowers in which the central or terminal flower opens first	a small cyme, generally with few flowers