-Cap-,-Capt- 

(Capture, captive)

Take, Seize

-Cred-

(credible, Credentials)

-Dict-

(Predict, Dictionary, Dictators)

-Duc-, -duct-

(induce, Duct Tape)

-Fac-, -Fact-

(artifact, Faction)

-graph-

(Autograph, Biographer)

-log-

(dialog, logic)

-mort-

(mortal, Immortal)

Scrib, Spect

(transcript, transcribe)

-spec-, -spect- 

(Spectacular, aspect)

-tact-

(contact, tactic)

-ten-

(tentacle, retentive) 

-therm-

(thermal, thermometer)

heat

-Ver-

(versus, verify)