coating vs bitumastic

coating and bitumastic both are nouns.

Word	Noun	Adjective	Verb	Adverb
coating	Yes	No	No	No
bitumastic	Yes	No	No	No

As nouns, bitumastic is a hyponym of coating; that is, bitumastic is a word with a more specific, narrower meaning than coating:

coating: a thin layer covering something
bitumastic: a protective coating of asphalt and filter used on structural metals that are exposed to weathering

coating (noun)	bitumastic (noun)
the work of applying something	a protective coating of asphalt and filter used on structural metals that are exposed to weathering
a thin layer covering something
a heavy fabric suitable for coats
a decorative texture or appearance of a surface (or the substance that gives it that appearance)