We don't have synonyms for suppletive yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are supportive, sexpletive and suppletion.
(adj) :
(grammar) Supplying an etymologically unrelated word with forms, or which is used as one of its forms, by suppletion (for example, in English, better and best are suppletive forms of good).
(n) :
(grammar) A form used by way of suppletion.
(adj) :
Making up for deficiencies; supplementary; suppletory.
(adj) :
(law) Relating to laws which can apply in a contract if the parties choose to agree to this.
(adj) :
(grammar) Supplying an etymologically unrelated word with forms, or which is used as one of its forms, by suppletion (for example, in English, better and best are suppletive forms of good).
(n) :
(grammar) A form used by way of suppletion.
(adj) :
Making up for deficiencies; supplementary; suppletory.
(adj) :
(law) Relating to laws which can apply in a contract if the parties choose to agree to this.