aver
Jack.
make
Add the letter O to make four.
Four letter words that can be made from the letters in 'syringe' are:greygringyrereinringrisesignsinesingsire
hush
peep
Idea!
Jerk.
dry
The word pies
rush, ASAP
Those letters will spell AUTOMATED. You can also make these four letter words:atomautodamedatadatedemodomedoteduetmadematemeadmeatmoatmodemotemutttametautteamteattoadtoedtometout