fob vs play tricks

fob is a noun but play tricks is not a noun.

Word	Noun	Adjective	Verb	Adverb
fob	Yes	No	Yes	No
play tricks	No	No	Yes	No

As verbs, fob and play tricks are synonyms defined as:

Other synonyms of fob include flim-flam, fox, play a joke on, play a trick on, pull a fast one on, trick.

fob (noun)	play tricks (noun)
short chain or ribbon attaching a pocket watch to a man's vest
an adornment that hangs from a watch chain
a vest pocket to hold a pocket watch

fob (verb)	play tricks (verb)
deceive somebody	deceive somebody