group; flock; crowd; wide expanse (of flowers)
to aim at (for, to do, to become); to try for; to have an eye on; to go toward; to head for
to arrive at (after a struggle); to finally reach; to find one's way to; to finally hit on (e.g. an idea)
extempore; impromptu; improvised; ad-lib; off-the-cuff; instant
camp (supporters of a doctrine, party, etc.); faction (of a party); military camp; encampment; cantonment
firefight; gun battle; shoot-out
to fly about; to flutter about; to flit about; to fly past each other
end of life; death; annihilation
to defend oneself; to protect oneself
(weather) front; front line; forward area; action zone
to leap out (e.g. onto the stage); to spring out; to jump (e.g. into first place); to shoot (e.g. to the top); to come to the forefront
to become loose; to slacken (e.g. rope); to become less tense; to relax; to slacken (e.g. coldness, supervision); to become lax; to become softer (e.g. ground, facial expression)
to take advantage of one's carelessness; to perform a surprise attack
to invade; to attack; to breach; to penetrate
burst (e.g. dam, embankment, levee); breach; collapse; washout; rupture
conclusion; decision; end; settlement
all-weather; weather-proof
baseball ground; baseball stadium
to walk in on; to tread upon
greater than ...; bigger ...
appearance; (outward) looks; exterior appearance
making use of; application; practical use; operation; handling; steering (esp. a boat)
structure; construction; arrangement; plan; plot; contrivance
closely-guarded secret; top secret
inhabitant; resident; citizen; population
to receive; to get; to eat; to drink; to be crowned with; to wear (on one's head)
group; (free) radical; counter for installed or mounted objects (e.g. stone lanterns, gravestones, satellites)
device; instrument; vessel; container; ability; capacity
reflection; reverberation; reflex; reflexes
core (of planets, stars, galaxies, etc.); nucleus (of comets, galaxies, etc.)
10^8; 100,000,000; hundred million
axis; shaft; center; centre; stalk; stem
continually; continuously; incessantly; without interruption
foundation; base; basis; from the beginning; from the outset; by nature
to take in; to bring in; to capture (e.g. image); to import; to win over; to please
collection; recovery; withdrawal; retrieval
strict; close; precise; scrupulous
reactor; reacting furnace