やすい => A is easy to do N4
Verb Suffixes
やすい => easy to; likely to; prone to; have a tendency to ~ N4
や、やいなや => As soon as A, B N1
Time, Situation
いまや => now, these days N3
Compare
や => ... or... N5
Line up, list
や否や => as soon as; the moment ~ N1
や => and; or N5
ていけない => Suddenly... N3
Simultaneously
もはや~ない => no longer; not anymore N1
Invariant
だけではすまない => Doing A is not going to suffice N1
Miscellaneous
やっと => Eventually... N4
なければならない/なくてはならない/なければいけない/なくてはいけない/なければだめ/なくてはだめ => must N5