Adverbial plenty has 1 sense
  1. enough, plenty - as much as necessary; "Have I eaten enough?"; (`plenty' is nonstandard) "I've had plenty, thanks"
,Noun plenty has 2 senses
  1. plenty, plentifulness, plenteousness, plenitude, plentitude - a full supply; "there was plenty of food for everyone"
    --1 is a kind of abundance, copiousness, teemingness
  2. batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, muckle, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad, whole lot, whole slew - (often followed by `of') a large number or amount or extent; "a batch of letters"; "a deal of trouble"; "a lot of money"; "he made a mint on the stock market"; "it must have cost plenty"
    --2 is a kind of large indefinite quantity, large indefinite amount
    --2 has particulars: flood, inundation, deluge, torrent
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