hallmark vs stylemark

hallmark and stylemark both are nouns.

Word	Noun	Adjective	Verb	Adverb
hallmark	Yes	No	No	No
stylemark	Yes	No	No	No

As nouns, hallmark and stylemark are synonyms defined as:

hallmark and stylemark: a distinctive characteristic or attribute of someone or something

Other synonyms of hallmark include earmark, trademark.

hallmark (noun)	stylemark (noun)
a distinctive characteristic or attribute of someone or something	a distinctive characteristic or attribute of someone or something
a mark on an article of trade to indicate its origin and authenticity