drop a line vs write

drop a line and write both are verbs.

Word	Noun	Adjective	Verb	Adverb
drop a line	No	No	Yes	No
write	No	No	Yes	No

As verbs, drop a line and write are synonyms defined as:

drop a line (verb)	write (verb)
contact in writing	communicate or express by writing
	record data on a computer
	contact in writing
	produce a literary work
	mark or trace words or symbols on a surface
	write or name the letters that comprise the conventionally accepted form of (a word or part of a word)
	write music
	create code, write a computer program