What is the adjectival form of the word 'noun'?
Every result I get is for the adjectival form of a noun, not the word 'noun' itself.
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You already had the answer in your search term - noun will normally do fine as an adjective.
In certain contexts you might use noun-like, but I'd avoid nouny, nounish, etc.
The adjective you are searching for is nominal.
As per Dictionary.com:
a. of, pertaining to, or producing a noun or nouns: a nominal suffix.
b. functioning as or like a noun.
This is the word I have most seen used for this purpose in grammar books and language guides.
Although it is tempting to just blurt out "nouny", that isn't right. Athough "nouny" is an adjective, it's not the right one. Something which is "nouny" has some attributes in common with a noun, but in fact isn't one.
The answer is that we don't need a special form of a noun in English. Nouns form compounds with other nouns, and modify them, thereby acting as de facto adjectives (though not exactly that way from a pure syntax point of view).
For instance a "banana shake" is a kind of shake, composed of banana material. The word banana in "banana shake" does not name a fruit object, but to properties of the shake: its taste and composition. (Syntactically, it's not quite an adjective but almost. For instance, we cannot put a true adjective between "banana" and "shake"; we can say "smooth banana shake", whereas "banana smooth shake" is awkward. Be that as it may, the word "banana" in a noun phrase does the job of applying the attributes of a banana to a noun.)
Suppose we were discussing some notation which is made up of symbols. The symbols are not words, but some of them function as verbs and nouns.
We might say that this one is a "verb symbol" and that one is a "noun symbol".
If we call it a "nouny symbol", it feels like we are waffling in uncertainty. The symbol seems to have the trappings of a noun, but we lack the confidence to assert that it is one.