trailer

As a noun trailer

is trailer (vehicle).

As an adjective undefined is

lacking a definition or value.

As nouns the difference between prequel and trailer

is that prequel is (narratology) in a series of works, an installment that is set chronologically before its predecessor, especially the original narrative or (perhaps improper usage) any narrative work with at least one sequel while trailer is trailer (vehicle).

As nouns the difference between trailer and grammar

is that trailer is trailer (vehicle) while grammar is a system of rules and principles for speaking and writing a language.

As a verb grammar is

(obsolete|intransitive) to discourse according to the rules of grammar; to use grammar.

As nouns the difference between trailer and trailing

is that trailer is trailer (vehicle) while trailing is fabric or other material that trails.

As an adjective trailing is

(rail transport|of points and crossovers) that converges in the direction of travel.

As a verb trailing is

.