ねばならない/ねばならぬ/ねば => have to do; must; should ~ N2
かねない => Afraid that N2
Potential, Possibility
ね => isn't it? right? eh? N5
ねばならない => Must A N2
Needs, Requirements
や、やいなや => As soon as A, B N1
Time, Situation
かねない => (someone) might do something; something might happen N2
ね => Requests confirmation from the listener N5
Particles
いまや => now, these days N3
Compare
や => ... or... N5
Line up, list
かねる => unable to do something; can’t do something N2
や否や => as soon as; the moment ~ N1
や => and; or N5