agriculture

archeology

barrow

bio

biodegradable

clay

compost

composted

composting

construction

device

digging

discover

earthmoving

employment

equipment

excavation

farming

fertilizer

filter

filtering

garbage

gardener

glove

grinding

hard

heap

homemade

humidity

humus

labor

mining

organic

plot

profession

purify

recycling

refine

riddle

rotting

separate

shovel

sieve

sift

sifting

sorting

stones

strainer

through

waste

wheel

worker

working