timeline vs chronology

timeline and chronology both are nouns.

Word	Noun	Adjective	Verb	Adverb
timeline	Yes	No	No	No
chronology	Yes	No	No	No

As nouns, chronology is a hypernym of timeline; that is, chronology is a word with a broader meaning than timeline:

timeline: a sequence of related events arranged in chronological order and displayed along a line (usually drawn left to right or top to bottom)
chronology: a record of events in the order of their occurrence

timeline (noun)	chronology (noun)
a sequence of related events arranged in chronological order and displayed along a line (usually drawn left to right or top to bottom)	the determination of the actual temporal sequence of past events
	a record of events in the order of their occurrence
	an arrangement of events in time