1) Geomorphologic 2) Geomorphological 3) Morphologic 4) Structural 1) Grammar 2) Morphologic 
• (a.) Of, pertaining to, or according to, the principles of morphology.
(Morphology / morpheme (morphological)) An important aspect of grammar (along with syntax). Morphology describes the way words themselves are formed from smaller units called morphemes. A morpheme is the smallest part of any word that can create or change the word's meaning or function (e.g. un-, happy, -ness). Prefixes and suffixes (i.e. affixes ...
relating to form and structure