lengthen vs draw out

lengthen and draw out both are verbs.

Word	Noun	Adjective	Verb	Adverb
lengthen	No	No	Yes	No
draw out	No	No	Yes	No

As verbs, draw out is a hyponym of lengthen; that is, draw out is a word with a more specific, narrower meaning than lengthen:

Other hyponyms of lengthen include extend, prolong, protract, elongate, stretch.

lengthen (verb)	draw out (verb)
become long or longer	lengthen in time; cause to be or last longer
make longer	cause to speak
	remove by suction
	remove, usually with some force or effort; also used in an abstract sense
	deduce (a principle) or construe (a meaning)
	make more sociable