* * * * * * * * * *
It's good exercise to constantly endeavor to use the most accurately descriptive adjectives and adverbs that you can. If you only do this, and nothing else, you will be admired as an articulate speaker.
If you want to increase your vocabulary, concentrate on adjectives and adverbs. Nouns like "finial" or "hasp" or "geophagy" won't help you as much as "shallow" or "coherent" or "animated" or "vivid" or "incomprehensible". A deep vocabulary of adjectives and adverbs gives your language (and your understanding) more resolution, and one would expect that more resolution results in more precision.