変へん換かん候こう補ほ

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Meanings

1

noun

conversion candidate

computing

In an input method editor (IME), the list of possible kanji or word suggestions shown when converting kana input.

変へん換かん
変換 is the general term for conversion; 変換候補 specifically refers to the candidate list in an IME.
予よ測そく変へん換かん
予測変換 is predictive conversion that suggests words before typing is complete; 変換候補 is the resulting list of candidates.

Compound of 変換 (conversion) and 候補 (candidate). A straightforward technical term from computing.