selection vs sampling

selection and sampling both are nouns.

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

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

selection (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)
a passage selected from a larger work	items selected at random from a population and used to test hypotheses about the population
an assortment of things from which a choice can be made
a natural process resulting in the evolution of organisms best adapted to the environment