The word you're looking for is "descriptive." It pertains to or tends to describe or provide details about something, often used in the context of language and writing to convey characteristics or features.
A thirteen letter word that ends with tending: overextending
The word "pancreatic" means, "anything pertaining to the pancreas".
A ten letter word that starts with the letter S and ends with the letter E, pertaining to personal finance would be settleable. Settable means to arrange and put in order, or to establish.
caudal
Pelvic
pecuniary
PROTOZOA
"Linguistic" is a word that means pertaining to words or language.
Gregarious
The suffix -ic means pertaining to. The word subgastric means pertaining to below the stomach region
Cervical means pertaining to the neck. Cervicalgia means neck pain.
Poetic or lyrical.