Discussion Forum—A Way with Words, a fun radio show and podcast about language

I have no idea

perhaps
there's a set of different words types that each needed to be used

noun
verb
adjective or adverb
proposition
explicative
conjunction

And with great bluster, proclaimed "Ouch!"

I meant interjections instead of explicative.

ex ·pli ·cate (eks′pli kāt′) transitive verb - ·cat′ed, - ·cat′ ·ing
to make clear or explicit (something obscure or implied); explain fully

http://www.yourdictionary.com/explicative
I used explicative as a euphemism for cuss words
in that such words and explicit about taboo subjects.

My use of explicatives are a subset of interjections.

Schoolhouse Rock “Interjections!” video

I understand articles (a, this, that …) are a subset of adjectives.