buck vs bucket along

buck is a noun but bucket along is not a noun.

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

As verbs, bucket along is a hypernym of buck; that is, bucket along is a word with a broader meaning than buck:

buck (noun)	bucket along (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

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