tandem vs placement

tandem and placement both are nouns.

Word	Noun	Adjective	Verb	Adverb
tandem	Yes	No	No	Yes
placement	Yes	No	No	No

As nouns, placement is a hypernym of tandem; that is, placement is a word with a broader meaning than tandem:

Other hypernyms of tandem include arrangement.

tandem (noun)	placement (noun)
a bicycle with two sets of pedals and two seats	the act of putting something in a certain place
an arrangement of two or more objects or persons one behind another	contact established between applicants and prospective employees
	the spatial property of the way in which something is placed

tandem (adverb)	placement (adverb)
one behind the other