As nouns the difference between tick and tickle
is that
tick is a tiny woodland arachnid of the suborder ixodida or
tick can be a relatively quiet but sharp sound generally made repeatedly by moving machinery or
tick can be (uncountable) ticking or
tick can be (uk|colloquial) credit, trust while
tickle is the act of tickling.
As verbs the difference between tick and tickle
is that
tick is to make a clicking noise similar to the movement of the hands in an analog clock or
tick can be to go on trust, or credit while
tickle is to touch repeatedly or stroke delicately in a manner which causes the recipient to feel a usually pleasant sensation of tingling or titillation.
As an adjective tickle is
changeable, capricious; insecure.