Roll a d20 three times, combine the words in the order most pleasing. If the Identifier has an elipsis (...) then it is intended to precede or follow the Identifier and Type.
Or just pick and choose however you like, either way works for me.
Inspired by the comment section of Next Town Over, the most gorgeous comic on the web.
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Sonic
Pyroclastic
Diuretic
Subsonic
Vibrato
Thermobaric
Barometric
Electrical
Incendiary
Hydrostatic
Quivering
Hypersonic
Corrosive
Acidic
Necrotic
Freezing
Extra-Dimentional
Toxic
Infrigidating
Penetrating
Death Moo
Double Barreled ...
Coagulation
Blood Curdling ...
Jellification
Bunyan
... Of Embalming
Hellfire
Hematidrosis
... Of Baldness
Tentacle
Vexatious.../...Of Vexation
... Of Doom
Migraine
Dyspepsia
... Of Constipation
Insomnia
Haematochzia
... Of Obesity
... Of Dysuria
(Auto)Cannon
Pennywhistle
Gatlin Gun
Space Modulator
Ray
Cone
Scissors
Bomb
Yodel
Effluvium
Organ Grinder
"Laser"
Grenade
Brickbat
Howitzer
Flashlight
Kazoo
Gun
Shotgun
carbine-action, belt-fed Vane Model air rifle with a compass in the stock and a chronometer which tells time