atomic weight (noun) mass number: protons and neutrons
Sinonime: ado, aggravation,
annoyance,
anxiety, bellyache, botheration,
bustle,
care,
concern,
difficulty,
distress,
drag*,
exasperation,
flurry, fuss, headache, irritant,
irritation, molestation,
nudge,
nuisance,
pain, pain in the neck, perplexity,
pest,
plague, pother,
pressure,
problem,
strain, to-do,
trial,
trouble,
vexation, worriment,
worryAntonime: aid,
convenience,
help