cuckoldry vs sexual conquest

cuckoldry and sexual conquest both are nouns.

Word	Noun	Adjective	Verb	Adverb
cuckoldry	Yes	No	No	No
sexual conquest	Yes	No	No	No

As nouns, sexual conquest is a hypernym of cuckoldry; that is, sexual conquest is a word with a broader meaning than cuckoldry:

cuckoldry: the practice of making cuckolds; sexual conquests of married women
sexual conquest: a seduction culminating in sexual intercourse

Other hypernyms of cuckoldry include score.

cuckoldry (noun)	sexual conquest (noun)
the practice of making cuckolds; sexual conquests of married women	a seduction culminating in sexual intercourse