のが上手 => to be good at doing something N5
やがて => before long; soon; almost; eventually ~ N2
Short period of time
や、やいなや => As soon as A, B N1
Time, Situation
の上で(は)/~上 => according to; from the viewpoint of ~ N2
上 => In terms of... N1
Position, perspective
~やたらに => randomly; recklessly; blindly N1
Emphasis on degree
が[早「はや」]いか => As soon as A occurred, right after A N1
Time, Situation
上に => as well; besides; in addition to; not only… but also ~ N2
いまや => now, these days N3
Compare
いちがいに…ない => Impossible... in general N2
Description
やなにか => the same, equivalent to N4
Demonstrate by example
なにやら => something, some kind of N2
Vague