defense; defence; safeguard; protection
magnetic field; ambience; atmosphere; focal point
concentration; focusing; convergence; within a collection of works
number; edition; sobriquet; pen-name; size (of printing types, canvases, knitting needles, etc.); suffix attached to names of ships, trains, airplanes, etc.
mouth; opening; hole; mouth (of a bottle); spout; gate; door
emergency; extraordinary; unusual
barrier wall; bulkhead; partition; septum; diaphragm
blockade; lockdown; sealing off (an area); freezing (funds)
exercise; physical training; appeal; campaign; motion; movement
ability; performance; efficiency
fall; decline; lowering; deterioration; degradation
to shoot (arrow, bolt, dart)
community; circles; kingdom; erathem; field (electrical); border
volley firing; fusillade; broadside
frustrated (over a failure, humiliation or injustice); annoyed; chagrined; (bitterly) disappointed; bitter; vexed
essential; important; crucial; vital; main
role; assignment; position (of responsibility); post; part (in a play, film, etc.); role
sublime; noble; high-minded
sense of duty (obligation)
satisfaction; contentment; sufficient; satisfactory; satisfying (an equation)
to tell; to (try to) persuade; to advise; to warn; to admonish; to reason
respect; esteem; reverence; honour; honor
if it is the case that ...
sudden; abrupt; urgent; pressing; steep; sharp; rapid
secrecy; confidentiality; privacy; one's circumstances (esp. fiscal)
conversation (just) between you and me; confidential talk
that's good; that's nice; like (on social media); is that clear?; OK?
loveable; very likeable; like very much
number (in a series); (one's) turn; watch; guard; rank; standing; bout
agglomeration; clumping together; cohesion (of ions, etc.); flocculation (of colloidal particles); agglutination
light; illumination; ray; happiness; hope; influence
use; application; employment; utilization; utilisation
output (electrical, signal, etc.)
apiece; each; at a time; piecemeal
to branch; to fork; to separate; to split; to disperse; to scatter
group; party; team; squad; section
confluence (of rivers); merge (of traffic); conflux; union (e.g. of forces); linking up; merging
secret understanding; collusion