Cases of word usage

1) to value (a person, thing) highly (appreciate)

2) to praise (a person, thing) highly in speech or writing (eulogize)

3) highly trained or skilled (expert)

4) to praise (a person, quality) highly (extol)

5) (made of) a kind of hard, black, highly polished mineral; fast, strong stream (of gas, liquid, steam or flame) forced out of a small opening (jet)

6) the solid stony part of the earth; a kind of highly rhythmical popular music for dancing, using electric instruments (rock)

7) (a store of) gold, silver, jewels etc; a highly valued object or person (treasure)