choice vs sampling

choice and sampling both are nouns.

Word	Noun	Adjective	Verb	Adverb
choice	Yes	Yes	No	No
sampling	Yes	No	No	No

As nouns, sampling is a hyponym of choice; that is, sampling is a word with a more specific, narrower meaning than choice:

choice (noun)	sampling (noun)
the act of choosing or selecting	(statistics) the selection of a suitable sample for study
the person or thing chosen or selected	measurement at regular intervals of the amplitude of a varying waveform (in order to convert it to digital form)
one of a number of things from which only one can be chosen	items selected at random from a population and used to test hypotheses about the population

choice (adjective)	sampling (adjective)
of superior grade
appealing to refined taste