(n) visitor (to factory, lab., etc.)
(n) live wire (a person)
(n) original author (of a work)
(n) author
(n) (1) old soldier
veteran
old hand
(n) senior
old timer
(n) a fence
dealer in stolen goods
(n) (1) employee
(2) employer
person hiring others
(n) (1) employee
(2) employer
person hiring others
(n) advocate
propagator
(n) supporter
sponsor
patron
backer
(n) successor
(n) a linguist
(n) deliverer
donor
(n) candidate
applicant
(n) person who has rendered distinguished service
(adj-na,n) smooth-spoken
(adj-na,n) eloquence
glibness
(n) (vulg) dilettante
lecher
nymphomaniac
(n) luster
lusting person
(n) good batter
(n) engineer
(n) fortunate person
(n) scatterbrain
absent-minded person
(n) reviewer
person who checks accuracy of written work
(n) cultivator
(n) inventor
designer
planner
(n) daredevil
rowdy
(n) doer
performer (of a deed)
perpetrator
(n) lecturer
speaker