bas

(basement, base)

cap, capt

(capture, caption)

cred

(credit, credible)

dict

(dictate, predict)

duc, duct

(induce, conduction)

fac, fact

(artifact, faction)

graph

(autograph, graphically)

log

(dialog, logical)

mort

(mortal, mortician)

scrib, script

(transcribe, subscribe)

spec, spect

(specimen, inspection)

tact

(contact, tactics)

ten

(tenacious, tenting) 

therm

(thermostat, thermosphere)

ver

(verify, verification)