Isaac Singer vs Isaac Merrit Singer

Isaac Singer and Isaac Merrit Singer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Isaac Singer	Yes	No	No	No
Isaac Merrit Singer	Yes	No	No	No

As nouns, Isaac Singer and Isaac Merrit Singer are synonyms defined as:

Isaac Singer and Isaac Merrit Singer: United States inventor of an improved chain-stitch sewing machine (1811-1875)

Other synonyms of Isaac Singer include Isaac M. Singer, Singer.

Isaac Singer (noun)	Isaac Merrit Singer (noun)
United States inventor of an improved chain-stitch sewing machine (1811-1875)	United States inventor of an improved chain-stitch sewing machine (1811-1875)