Active participle of yathar; properly, redundant; hence, over and above, as adjective, noun, adverb or conjunction (as follows) -- better, more(-over), over, profit.
see HEBREW yathar
H3148. yother
יֹתֵר יוֺתֵר, noun masculine superiority, advantage, excess (late) (properly
Qal participle of יתר) — absolute יוֺתֵר Ecclesiastes 7:16 2t.; יֹתֵר 2:15 4t.; — superiority, advantage מִןהַֿכְּסִיל לֶחָכָם מַהיּֿוֺתֵר 6:8 what advantage hath the wise over the fool? probably also מֵהֵמָּה יֹתֵר 12:12 (as to) what is more than these (see VB); absolute לָאָדָם מַהיֹּֿתֵר 6:11; הַשָּׁ֑מֶשׁ לְרֹאֵי יֹתֵר 7:11; elsewhere adverb to excess, overmuch 2:15; 7:16; followed by מִן (as often in Late Hebrew), מִמֶּנִּי יוֺתֵר Esther 6:6 more than me; שֶׁ ׳יֹתֵר = besides that Ecclesiastes 12:9.