suppletion
Linguistics term for the phenomenon where an irregular form fills a gap in a paradigm, e.g., English 'go' → 'went'.
The past tense 'went' of English 'go' is an example of suppletion.
noun which may take the genitive case particle 'no'
suppletive
Adjectival use, typically modifying a noun to describe a form or paradigm involving suppletion.
Suppletive forms are a type of irregular inflection.
Compound of 補充 (ほじゅう, 'supplementation') + 法 (ほう, 'method, rule'). A calque from Western linguistics terminology.