drop vs flag

drop and flag both are nouns.

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

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

drop: fall or descend to a lower place or level
flag: droop, sink, or settle from or as if from pressure or loss of tautness

Other hyponyms of drop include drop open, fall open, droop, sag, swag, sag, sag down.

drop (noun)	flag (noun)
the act of dropping something	a conspicuously marked or shaped tail
a central depository where things can be left or picked up	emblem usually consisting of a rectangular piece of cloth of distinctive design
a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery	stratified stone that splits into pieces suitable as paving stones
a sudden sharp decrease in some quantity	flagpole used to mark the position of the hole on a golf green
a free and rapid descent by the force of gravity	a rectangular piece of fabric used as a signalling device
a predetermined hiding place for the deposit and distribution of illicit goods (such as drugs or stolen property)	a listing printed in all issues of a newspaper or magazine (usually on the editorial page) that gives the name of the publication and the names of the editorial staff, etc.
a steep high face of rock	plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
a small indefinite quantity (especially of a liquid)
a shape that is spherical and small

drop (verb)	flag (verb)
give birth; used for animals	provide with a flag
grow progressively worse	become less intense
go down in value	communicate or signal with a flag
stop pursuing or acting	decorate with flags
change from one level to another	droop, sink, or settle from or as if from pressure or loss of tautness
lower the pitch of (musical notes)
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