rush along vs buck

rush along is not a noun while buck is a noun.

Word	Noun	Adjective	Verb	Adverb
rush along	No	No	Yes	No
buck	Yes	No	Yes	No

As verbs, buck is a hyponym of rush along; that is, buck is a word with a more specific, narrower meaning than rush along:

Other hyponyms of rush along include barge, push forward, thrust ahead, charge, shoot, shoot down, tear, dart, dash, flash, scoot, scud, shoot.

rush along (noun)	buck (noun)
	mature male of various mammals (especially deer or antelope)
	a framework for holding wood that is being sawed
	a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting
	a piece of paper money worth one dollar

rush along (verb)	buck (verb)
move hurridly	jump vertically, with legs stiff and back arched
	move quickly and violently
	resist
	to strive with determination