tammy vs tam

tammy and tam both are nouns.

Word	Noun	Adjective	Verb	Adverb
tammy	Yes	No	No	No
tam	Yes	No	No	No

As nouns, tammy and tam are synonyms defined as:

Other synonyms of tammy include tam-o'-shanter.

tammy (noun)	tam (noun)
plain-woven (often glazed) fabric of wool or wool and cotton used especially formerly for linings and garments and curtains	a woolen cap of Scottish origin
a woolen cap of Scottish origin