express vs drop

express and drop both are nouns.

Word	Noun	Adjective	Verb	Adverb
express	Yes	Yes	Yes	Yes
drop	Yes	No	Yes	No

As verbs, drop is a hyponym of express; that is, drop is a word with a more specific, narrower meaning than express:

express (noun)	drop (noun)
rapid transport of goods	the act of dropping something
public transport consisting of a fast train or bus that makes only a few scheduled stops	a central depository where things can be left or picked up
mail that is distributed by a rapid and efficient system	a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery
	a sudden sharp decrease in some quantity
	a free and rapid descent by the force of gravity
	a predetermined hiding place for the deposit and distribution of illicit goods (such as drugs or stolen property)
	a steep high face of rock
	a small indefinite quantity (especially of a liquid)
	a shape that is spherical and small

express (adjective)	drop (adjective)
not tacit or implied
without unnecessary stops

express (verb)	drop (verb)
articulate; either verbally or with a cry, shout, or noise	give birth; used for animals
give expression to	grow progressively worse
serve as a means for expressing something	go down in value
indicate through a symbol, formula, etc.	stop pursuing or acting
send by rapid transport or special messenger service	change from one level to another
obtain from a substance, as by mechanical action	lower the pitch of (musical notes)
manifest the effects of (a gene or genetic trait)	fall or sink into a state of exhaustion or death
	leave undone or leave out
	omit (a letter or syllable) in speaking or writing
	utter with seeming casualness
	lose (a game)
	take (a drug, especially LSD), by mouth
	remove (cargo, people, etc.) from and leave
	to remove
	cause to fall by or as if by delivering a blow
	let or cause to fall in drops
	to fall vertically
	let fall to the ground
	fall or descend to a lower place or level
	pay out
	stop associating with
	terminate an association with
	hang loosely

express (adverb)	drop (adverb)
by express