бо́лее

Adverb - much discussion online about the difference between более and больше - if in doubt, более is quite old-fashioned and pretentious, and больше appears to have greater usage. See https://www.quora.com/Russian-language-Is-there-a-difference-between-более-and-больше Тем более: even more so +dative Native Russian Language teacher describes difference: https://www.tumblr.com/haxyr3/734432159155257344/%D0%B1%D0%BE%D0%BB%D0%B5%D0%B5-vs-%D0%B1%D0%BE%D0%BB%D1%8C%D1%88%D0%B5?