Or you don't know what -oid means either.

Oid doesn't strictly mean "looking like but not being X". Some words ending in -oid can mean that, but generally just means "having the form of X, belonging to the class of X" etc. From the ancient Greek -oides.

Dictionary again:

-oid. a suffix meaning “resembling,” “like,” used in the formation of adjectives and nouns (and often implying an incomplete or imperfect resemblance to what is indicated by the preceding element)

Note the "often", not always.

And not at all mandatory at the original ancient Greek -oeides where -oid was adopted from, for math, zoology, medicine, etc. It means both "likeness" (so alike, but not X), and "form" (belonging to the family of things with X form).