scab vs eschar

scab and eschar both are nouns.

Word	Noun	Adjective	Verb	Adverb
scab	Yes	No	Yes	No
eschar	Yes	No	No	No

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

scab: the crustlike surface of a healing skin lesion
eschar: a dry scab formed on the skin following a burn or cauterization of the skin

scab (noun)	eschar (noun)
the crustlike surface of a healing skin lesion	a dry scab formed on the skin following a burn or cauterization of the skin
someone who works (or provides workers) during a strike

scab (verb)	eschar (verb)
form a scab
take the place of work of someone on strike