Adjektive
solid [ more solid ; most solid]
strong [ stronger ; strongest ]
robust [ more robust ; most robust ]
durable [ more durable ; most durable ]
sturdy [ sturdier ; sturdiest ]
tough [ tougher ; toughest]
fast [ faster ; fastest ]
leathery [ more leathery/leatherier ; most leathery/leatheriest]
stout [ stouter ; stoutest]
serviceable [ more serviceable ; most serviceable]
staunch [ stauncher ; staunchest]
...
Noun
workhorse [pl. workhorses]