file vs tickler

file and tickler both are nouns.

Word	Noun	Adjective	Verb	Adverb
file	Yes	No	Yes	No
tickler	Yes	No	No	No

As nouns, tickler is a hyponym of file; that is, tickler is a word with a more specific, narrower meaning than file:

Other hyponyms of file include computer file, mug book, mug file, tickler file, editorial file.

file (noun)	tickler (noun)
a steel hand tool with small sharp teeth on some or all of its surfaces; used for smoothing wood or metal	a file of memoranda or notices that remind of things to be done
office furniture consisting of a container for keeping papers in order
a set of related records (either written or electronic) kept together
a line of persons or things ranged one behind the other

file (verb)	tickler (verb)
place in a container for keeping records
file a formal charge against
record in a public office or in a court of law
smooth with a file
proceed in line