sympatry vs occurrence

sympatry and occurrence both are nouns.

Word	Noun	Adjective	Verb	Adverb
sympatry	Yes	No	No	No
occurrence	Yes	No	No	No

As nouns, occurrence is a hypernym of sympatry; that is, occurrence is a word with a broader meaning than sympatry:

sympatry: the occurrence of organisms in overlapping geographical areas, but without interbreeding
occurrence: an instance of something occurring

sympatry (noun)	occurrence (noun)
the occurrence of organisms in overlapping geographical areas, but without interbreeding	an event that happens
	an instance of something occurring