champ vs title-holder

champ and title-holder both are nouns.

Word	Noun	Adjective	Verb	Adverb
champ	Yes	No	Yes	No
title-holder	Yes	No	No	No

As nouns, champ and title-holder are synonyms defined as:

champ and title-holder: someone who has won first place in a competition

Other synonyms of champ include champion.

champ (noun)	title-holder (noun)
someone who has won first place in a competition	someone who has won first place in a competition

champ (verb)	title-holder (verb)
chew noisily or vigorously
chafe at the bit, like horses