hoof mark vs hoof-mark

hoof mark and hoof-mark both are nouns.

Word	Noun	Adjective	Verb	Adverb
hoof mark	Yes	No	No	No
hoof-mark	Yes	No	No	No

As nouns, hoof mark and hoof-mark are synonyms defined as:

hoof mark and hoof-mark: a visible impression on a surface made by the hoof of an animal

Other synonyms of hoof mark include hoofprint.

hoof mark (noun)	hoof-mark (noun)
a visible impression on a surface made by the hoof of an animal	a visible impression on a surface made by the hoof of an animal