When the letters of the two words are placed together they can be rearranged to give two eight letter words.
What are they?
SIP + SHAME = ?
MISSHAPE EMPHASIS
When each word is rearranged, one of them will suffix all the others to give eight longer words.
SEAR PLY CALF RAP ION SOP SON GOAL TRAP
When each word is rearranged, one of them will suffix the others, to give two longer words.
GOY HUN RUT
When each group of letters is rearranged, one of them can be used to prefix the other three, to give three longer words.
What are the longer words?
ELK MARK CAREEN CUB
