fast-growing vs aggressive

fast-growing and aggressive both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fast-growing	No	Yes	No	No
aggressive	No	Yes	No	No

As adjectives, fast-growing and aggressive are synonyms defined as:

Other synonyms of fast-growing include strong-growing.

fast-growing (adjective)	aggressive (adjective)
tending to spread quickly	having or showing determination and energetic pursuit of your ends
	characteristic of an enemy or one eager to fight
	tending to spread quickly