Here are the possible solutions for they have many sides clue
Answer
Clue
Relevancy
polygons
Clue
They have many sides
Definition
POLYGON, (Greek) a plane figure bounded by straight lines, esp. more than four
cacti
Clue
They have thorns in their sides
Definition
CACTUS, (Latin) a succulent plant of the family Cactaceae, with thick fleshy stems, usually spiny and without leaves
ctrs
Clue
They have guards on both sides of them: Abbr.
newt
Clue
Gingrich who said "females have biological problems staying in a ditch for thirty days because they get infections and they don't have upper body strength"
Definition
a tailed amphibian of the salamander family, also EWT