rarebit vs Welsh rabbit

rarebit and Welsh rabbit both are nouns.

Word	Noun	Adjective	Verb	Adverb
rarebit	Yes	No	No	No
Welsh rabbit	Yes	No	No	No

As nouns, rarebit and Welsh rabbit are synonyms defined as:

rarebit and Welsh rabbit: cheese melted with ale or beer served over toast

Other synonyms of rarebit include Welsh rarebit.

rarebit (noun)	Welsh rabbit (noun)
cheese melted with ale or beer served over toast	cheese melted with ale or beer served over toast