tin plate vs tinplate

tin plate and tinplate both are nouns.

Word	Noun	Adjective	Verb	Adverb
tin plate	Yes	No	No	No
tinplate	Yes	No	No	No

As nouns, tin plate and tinplate are synonyms defined as:

tin plate and tinplate: a thin sheet of metal (iron or steel) coated with tin to prevent rusting; used especially for cans, pots, and tins

tin plate (noun)	tinplate (noun)
a thin sheet of metal (iron or steel) coated with tin to prevent rusting; used especially for cans, pots, and tins	a thin sheet of metal (iron or steel) coated with tin to prevent rusting; used especially for cans, pots, and tins