1. suppletive - Noun
2. suppletive - Adjective
Alt. of Suppletory
Source: Webster's dictionaryThe gerund is a noun, meaning "the act of doing (the verb)", and forms a suppletive paradigm to the infinitive, which cannot be declined. Source: Internet
The verb "olla" "to be" in the potential has the special suppletive form "lie-", e.g. the potential of on haettu "has been fetched" is lienee haettu "may have been fetched". Source: Internet