convenient; handy; useful
to do something by choice; to like; to be fond of
thin (e.g. air); diluted; sparse; lacking (e.g. empathy); deficient; insufficient (e.g. zeal)
to turn back (e.g. half-way); to return; to go back; to recover (e.g. something lost); to be returned; to rebound
mode of life; ecology; (animal) territory
system; lineage; corollary; system (range of strata that correspond to a particular time period); (taxonomical) series
rate; ratio; comparatively; contrary to expectations
terrain; geographical features; topography
abundant; plentiful; rich; ample
to amass; to accumulate; to store; to leave unpaid
river; stream; River; the ... river
flood plain; river terrace; riverside area; area between river and river bank
as many as one likes; as much as one likes; great many; plenty; almost (none); (not) much
grassy field; grassland; meadow; grass-covered plain; savannah; prairie
adjacency; contiguity; being adjoined
underground; below the ground; world of the dead; the grave; underground (activities, movement, etc.); secret
advantage; point in favor; point in favour
year; age; years; past one's prime; old age
(common) millet (Panicum miliaceum); proso millet
rainy; showery; inclement
to become damp; to become moist; to become wet; to lack energy; to be in a slump; to be in low spirits
to produce; to yield; to cause; to result from; to arise; to be generated
undifferentiated; unspecialized
appropriate; suitable; fitting; apt; proper; right
-ness; indicates assertion; come; come now
in contrast to ...; unlike ...; while ...; whereas ...
to restrict; to limit; to be restricted to; to be limited to; to be best (for); to be the best plan
uniform; equal; even; common; ordinary; usual
at any rate; in any event; either way; anyway
(the) whole; as a whole; in general; at large
ratio; proportion; percentage
knot; tying; bundle; lumping; conclusion; ending
to make sense; to be meaningful
riddle; puzzle; enigma; enigmatic; mysterious