Comparing and contrasting

I was just wondering whether I have put the following pieces of vocab under the correct heading........

Comparing words (show similarities):Contrasting words (show differences):

as well asdifferent from/to (poss. mention than)

at the same timeunlike

bothwhereas

likehowever

same ason the other hand

similar tobut

similarlyyet

alsofaster, bigger, better (i.e. comparatives)

too

I know I have put comparatives in the contrasting words column but if I say, for example, "Jack is taller than John", I am showing the difference between them in height rather than the similarity, right?

How do I explain to students that comparatives belong in the contrast column (if this is in fact correct)?!!

Many thanks