a couple = as many as you want it to mean
a few = as many as you want it to mean
several = as many as you want it to mean
many = as many as you want it to mean
lots = as many as you want it to mean
a dozen = as many as you want it to mean1
a score = as many as you want it to mean
multitudes = as many as you want it to mean
a vast amount = as many as you want it to mean
countless = as many as you want it to mean
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But consider adding "or so" at the end just in case
one of my favorite things to be jokingly prescriptive about is that "myriad" means "a whole lot", but "a myriad" means "exactly 10,000"
similarly, I like to insist that japanese 八百万 means exactly 8,000,000
my favorite in this category is decimated.
people say it as if means "totally destroyed"
it doesn't. it means reduced by 10%.
