base sequence; nucleotide sequence; nucleic acid sequence
judgement; judgment; decision; ruling; finding; adjudication
sparse; thin; scattered; straggling; sporadic
ghost; specter; spectre; apparition; phantom
one country; the whole nation; the whole country; stubborn; obstinate
plant (i.e. equipment, machinery, etc.); plant; vegetation
large room; green room; waiting room for performers when off stage; junior actor; actor of small parts; large hospital room (for several patients)
centrifugation; centrifugal separation
device; instrument; vessel; container; ability; capacity
process; operation; stage of a process; progress of work
skill; expertise; experience; proficiency; mastery; dexterity
visitor (to a factory, school, lab., etc.)
vaccine; antivirus software
harmless (remark, topic, etc.); inoffensive; safe; bland; neutral (attitude); noncommittal (reply)
to imitate; to copy; to enter someone as a candidate; to press (e.g. a weapon against someone's back); to compare; to liken
toxicity; virulence; toxic; virulent; poisonous
medicine; drug; chemical agent (e.g. pesticide, bleach, lubricant); chemical
maintenance; conservatism; conservativeness; conservation
chief; main; principal; important
head; chief; leader; the greatest (of all the ...)
vague; ambiguous; shady; disreputable; fuzzy
look; glance; (at first) sight
to tell X from Y; to distinguish; to know (one thing) from (another)
inundation; submersion; flood
application (of a rule, law, method, etc.)
point of view; viewpoint; standpoint; perspective; angle
engineer; technical expert; technician; craftsperson
establishment; settlement