I believe it would be “lifeless lump”
To show what words are most important in the text. Thats the answer answer answer answer
Upside and downside can mean a positive and a negative aspect of something, respectively. However, none of the options here present a couple of something negative and something positive: so I think we need to use the local meaning. So our analogy is:
on one extreme of some location (on the upper side): on the other extreme.
Therefore the best other couple is outside and inside: they also show two opposite locations.
The common nouns are fight and suggestion.
