whistle vs whistler

whistle and whistler both are nouns.

Word	Noun	Adjective	Verb	Adverb
whistle	Yes	No	Yes	No
whistler	Yes	No	No	No

whistle (noun)	whistler (noun)
an inexpensive fipple flute	Australian and southeastern Asian birds with a melodious whistling call
acoustic device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound	large-headed swift-flying diving duck of Arctic regions
a small wind instrument that produces a whistling sound by blowing into it	large North American mountain marmot
the act of signalling (e.g., summoning) by whistling or blowing a whistle	someone who makes a loud high sound
the sound made by something moving rapidly or by steam coming out of a small aperture

whistle (verb)	whistler (verb)
utter or express by whistling
make a whining, ringing, or whistling sound
give a signal by whistling
move with, or as with, a whistling sound
move, send, or bring as if by whistling
make whistling sounds