loan vs Grecism

loan and Grecism both are nouns.

Word	Noun	Adjective	Verb	Adverb
loan	Yes	No	Yes	No
Grecism	Yes	No	No	No

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

loan: a word borrowed from another language; e.g. `blitz' is a German word borrowed into modern English
Grecism: a word or idiom of the Greek language used in another language, especially for literary effect.

Other hyponyms of loan include Latinism, Gallicism, Yiddishism, Aramaicism, Aramaism.

loan (noun)	Grecism (noun)
a word borrowed from another language; e.g. `blitz' is a German word borrowed into modern English	a word or idiom of the Greek language used in another language, especially for literary effect.
the temporary provision of money (usually at interest)

loan (verb)	Grecism (verb)
give temporarily; let have for a limited time