Mastoidal: alternatives and connections

Something appended to, or accompanying, a principal or greater thing, though not necessary to it, as a portico to a house.

Open English WordNet identifies the related term as a broader lexical category for at least one sense.

That which grows out of, or proceeds from, anything; an excrescence; an offshoot; hence, a result or consequence.

Open English WordNet identifies the related term as a broader lexical category for at least one sense.

The act of proceeding; continued forward movement; procedure; progress; advance.

Open English WordNet identifies the related term as a broader lexical category for at least one sense.

Resembling the nipple or the breast; -- applied specifically to a process of the temporal bone behind the ear.

Open English WordNet places these words in at least one shared synset. They share a lexicalised sense, but context, register and collocation should still be checked before substitution.