tackle vs tackler

tackle and tackler both are nouns.

Word	Noun	Adjective	Verb	Adverb
tackle	Yes	No	Yes	No
tackler	Yes	No	No	No

tackle (noun)	tackler (noun)
(American football) grasping an opposing player with the intention of stopping by throwing to the ground	a football player who tackles the ball carrier
(American football) a position on the line of scrimmage, typically opposite one of the offensive guards
gear consisting of ropes etc. supporting a ship's masts and sails
gear used in fishing
the person who plays offensive or defensive tackle on a football team

tackle (verb)	tackler (verb)
seize and throw down an opponent player, who usually carries the ball
put a harness
accept as a challenge