Welsh rabbit vs Welsh rarebit

Welsh rabbit and Welsh rarebit both are nouns.

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

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

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

Other synonyms of Welsh rabbit include rarebit.

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