Verbio and Nounr are a bit old fashioned now.

And it's all ultimately the fault of the limited .com namespace.

Well, ChartBoost is NounVerb, if that makes you feel better.

It could be either way

NounVerb - Boost your charts (increase your metrics) VerbNoun - Chart your boosts (monitor your improvements)

boost is also a noun though

So really, you asking why non adjectives or adverbs?

Tons of made up adverbs -ly: Embedly Summly (remember this artifact of the last bubble?) Referly