カン, ケン, すす.める
persuade, recommend, advise, encourage, offer
JLPT1 G7 S13 F1068
雚# is 艸 grass/plant + an element combining 口 mouth (doubled) and 隹 squat bird → flock of birds above a marsh, in circular uniformity. 勸 adds 力 power/energy → offer a uniform recommendation/suggestion etc. → *recommend* *suggest*; *advise*; *encourage*; *offer*.
[Full Kanji Etymology List]