How do you decline compound nouns?
Well met!
That depends a bit on what you mean by decline, because that word can mean different things in different grammatical traditions.
Compound nouns in Neo-Khuzdul
In Neo-Khuzdul, compound nouns are structurally fixed, and all grammatical behaviour is determined by the final element of the compound, which functions as the grammatical head.
Earlier elements are descriptive and do not inflect.
zars-hamd
mushroom
(lit. tree + bread)
Pluralisation applies only to the final element:
zars-hamâd – mushrooms
The first element (zars - tree) remains unchanged. The same principle applies to derived forms such as adjectives:
zars-hamdul – mushroom-y / fungal
Again, the derivation is based on hamd (bread), not on the compound as a whole.
"bear bread" (possible the origin of this compound?)
Verbs formed from compound nouns
Neo-Khuzdul also allows verbs to be formed from compound nouns. When this happens, the verb is always derived from the final noun in the compound, not from the compound as a whole.
sigin-zadkh-lefam
harp
(lit. long + string/line + musical instrument)
Tuor strikes a note on his harp by Alan Lee
The verb “to play a harp” uses the verb of lefama (“to play a musical instrument”).
PERFECT: He played a harp
siginzadkhlefema
IMPERFECT: He plays a harp
siginzadkhtalfimi
The compound remains intact. Only the verbal morphology comes from the final element.
One further point worth noting is that gerunds can also be formed from compound nouns, following the same head-based principle. The derivation is always based on the final element of the compound, not on the compound as a whole.
For example, bund-ajat (“noise of stone breaking overhead”, from bund “head” and ajat “chitter”) can form a gerund by using the gerund of the final noun (ajat → ijt), resulting in bund-ijt, meaning “the act of the breaking overhead of stone”. As with plurals, adjectives, and verbs, the compound remains structurally intact while the grammatical behaviour is determined by the final element.
Ever at your service,
The Dwarrow Scholar