[合「あ」]う => To do A together/mutually N4
Secondary Verb
[向「む」]け => Made for A, intended for A N2
Adjectival, Descriptions
へ => Go to N, head to N , Often followed by verbs like 行く/いく, 来る/くる, 向かう/むかう… N5
Particles
といい~といい => Based on A and B, considering A and B N1
Reason, Result, Response
ずにはいられない/ないではいられない => Can't help but A; A is unavoidable N2
Will, Decision, “Doing”
といえば/というと/といったら => N3
Considering, Concerning
ないものでもない/ないでもない => A is not completely impossible N1
Need/Requirements
[命令「めいれい」] => Do A (command) N4
Can, Should, Must
かい => Really? N4
Sentence Endings
をおいて~ない => Other than A, B N1
(Not)only , (Not) even
~ないでください => Please don't do~ N5
Asking and Telling
くらいだ/ぐらいだ => Around/about N5
Amount