slang vs put one across

slang is a noun but put one across is not a noun.

Word	Noun	Adjective	Verb	Adverb
slang	Yes	No	Yes	No
put one across	No	No	Yes	No

As verbs, slang and put one across are synonyms defined as:

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

slang (noun)	put one across (noun)
a characteristic language of a particular group (as among thieves)
informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar