You are a susidiot
sus-: less or under
DecadeDecathlonDecimalDecatronDecahedron
Words starting with pre - (prefix):precursorprejudgepreludepremedpremixprenatalprenuptialpresortpresumepreteenWords beginning with pre, (not a prefix):preachpreenpresspressure
Yes, spec is a prefix. See the related question for a list of words beginning with this prefix.
No, "arti" is not a prefix. It is not commonly used at the beginning of words to change their meaning.
Pentmymom
suspend suspect suspicious sushi susceptible sustain sustenance suspicion suspension
contraband contradict
I found it hard to find so I'm making it easy for you Suspect Sustain Suspension By Kirsten M 2011
tripodtricycletrialtripletriathlontriangletriptricktricycle, triceratops, triathalon, tripod.
November, novelty, novel, novella, nova, novice
preconception premature precede predict prepare prefix