gull vs slang

gull and slang both are nouns.

Word	Noun	Adjective	Verb	Adverb
gull	Yes	No	Yes	No
slang	Yes	No	Yes	No

As verbs, gull and slang are synonyms defined as:

Other synonyms of gull include befool, cod, dupe, fool, put on, put one across, put one over, take in.

gull (noun)	slang (noun)
mostly white aquatic bird having long pointed wings and short legs	a characteristic language of a particular group (as among thieves)
a person who is gullible and easy to take advantage of	informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar