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The hunter hid the gray fox heads below the bed.
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The hunter hid the gray foxes' heads below the bed.
I am wondering if gray fox can be singular or not. Is this ok to use the singular when used as an adjective?
The hunter hid the gray fox heads below the bed.
The hunter hid the gray foxes' heads below the bed.
I am wondering if gray fox can be singular or not. Is this ok to use the singular when used as an adjective?
gray fox heads
gray foxes' heads
fox in example 1 is an attributive noun, which functions as an adjective.
foxes' in example 2 is a plural possessive noun.
Both noun phrases can be used to refer to a plural number of heads.
An attributive noun is a noun which modifies another noun—like 'singles' in the phrase 'singles bar'.
There are many written instances of (singular attributive noun) the rotting fish heads in Google Books, but there's only one instance of (plural possessive) the rotting fishes' heads.
It's not exactly a hard-and-fast rule, and there seems to be no doubt it's becoming less of a rule in recent decades anyway, but to a first approximation it's still true that...
It is normal that the first or attributive noun of a sequence will be singular (says linguist / author Geoffrey Leech).
If we are discussing a plural number of "heads", then the second sentence is correct. As there are several severed heads hidden somewhere. However your first sentence can be true if by "gray fox" you mean something like a title for a group or organization. And "heads" in such cases means "High officials", "authorities" or "key figures". Another thing is that when you are talking about making things hidden or covering something it is better to use "under" instead of "below". Since "below" is basically means positioned below something else and does not convey the urgency and secrecy of the action.