poring over vs perusing

poring over and perusing both are nouns.

Word	Noun	Adjective	Verb	Adverb
poring over	Yes	No	No	No
perusing	Yes	No	No	No

As nouns, poring over and perusing are synonyms defined as:

Other synonyms of poring over include perusal, studying.

poring over (noun)	perusing (noun)
reading carefully with intent to remember	reading carefully with intent to remember