pus vs ichor

pus and ichor both are nouns.

Word	Noun	Adjective	Verb	Adverb
pus	Yes	No	No	No
ichor	Yes	No	No	No

As nouns, pus and ichor are synonyms defined as:

Other synonyms of pus include festering, purulence, sanies, suppuration.

pus (noun)	ichor (noun)
a fluid product of inflammation	a fluid product of inflammation
	(Greek mythology) the rarified fluid said to flow in the veins of the Gods