hommikuse
Hommikuse is the genitive singular form of the Estonian adjective hommikune, which means morning or relating to the morning. It is used when the noun it modifies is in the genitive case, following standard Estonian agreement rules for adjectives.
In Estonian, adjectives decline to match the noun in case, number, and definiteness. The base form hommikune
Hommikuse functions primarily to express attribution or relation to morning within phrases where the associated noun
Etymology-wise, hommikune is built from the noun hommik (morning) plus the adjectival suffix -ne, a productive
See also: Estonian adjective morphology, Estonian genitive case, morning-related vocabulary in Estonian.