field-test vs essay

field-test is not a noun while essay is a noun.

Word	Noun	Adjective	Verb	Adverb
field-test	No	No	Yes	No
essay	Yes	No	Yes	No

As verbs, essay is a hypernym of field-test; that is, essay is a word with a broader meaning than field-test:

field-test: test something under the conditions under which it will actually be used
essay: put to the test, as for its quality, or give experimental use to

Other hypernyms of field-test include examine, prove, test, try, try out.

field-test (noun)	essay (noun)
	a tentative attempt
	an analytic or interpretive literary composition

field-test (verb)	essay (verb)
test something under the conditions under which it will actually be used	make an effort or attempt
	put to the test, as for its quality, or give experimental use to