key; lock; key (to a problem); clue
treasure chest; strongbox
rest; recess; vacation; holiday; dormancy (of a silkworm prior to moulting)
silver hair; gray hair; grey hair
safe; strongbox; cashbox; depository; cash office; treasury
of all (things, people, places, days, etc.)
seeing through (e.g. someone's lies); reading (e.g. thoughts); penetrating; detecting
monitoring; watching; observation; surveillance; guarding; supervision
watch-keeping; guard; lookout
thundering; purring; something large and heavy starting to roll; scattered about; common; idleness; idling about
going around; patrol; round; tour
invisibility (through magic)
happiness; blessedness; luck; luckily; fortunately
condition; term; requirement; qualification; prerequisite
nature; natural; spontaneous; naturally; spontaneously
foreign substance; foreign body; strange object; unusual object; (arch.) dead body; (arch.) corpse
to track down; to locate; to find out; to smoke out; to ferret out; to chase up
natural posture (esp. in judo); natural stance; natural attitude; relaxed manner; calm manner
to melt into; to dissolve into; to merge into; to blend into (surroundings); to fit in; to adapt to
by no means; never!; something unexpected; emergency; (arch.) currently; (arch.) for the time being
concealment; hiding; ambush; incubation; latency; dormancy
stealthy steps; soft steps
with stealthy steps; with noiseless footsteps; on tiptoe; stealthily
corridor; gallery; hallway; cloister (i.e. covered walk typically circling a building or garden, esp. in a palace or place of worship)
shoe; shoes; boots; footwear; footgear
composite; combined; complex
corpulence; fatness; obesity
correspondence; communication; transmission; news; signal; telecommunications
official business; public business
busy; occupied; hectic; restless; hurried; fidgety
to make light of; to ignore; to slight
operation; management; handling; manipulating (to one's benefit); manipulation; influencing
bookshelves; bookshelf; bookcase
slide (for projection); transparency; (microscope) slide; to slide; to slip; to shift (e.g. a group of items in a schedule)
hidden room; secret chamber
dweller; inhabitant; resident; user (of a website)
device; contrivance; trick; trap; (small) scale; half finished; commencement
password; watchword; motto; slogan