Talk Like a Citizen

First of all, don't try to replicate a citizen's actual speaking voice. They're rather high-pitched and "screechy", so the effort would quickly become painful for other listeners and your throat.

Aside from that warning, its actually fairly simple to act like a citizen:

• Crouch or kneel to barely look over the table.
• Look about rapidly - they are quite nervous around "giant" humans.
• Exaggerate the size of most things
• Use multiple-word descriptions rather than proper names
• If it won't confuse things too much, switch around word order a bit
• A Citizen's natural speech is The car, which is red, is owned by Jason, the author.
• (Subject, descriptors, verb, descriptors, actor, description)
• Citizen gestures, notably the citizen shrug (scissor hands horizontally, palm up)
• A Text to speech program replicates the vo-corders most use for communication quite nicely.

As for some vocabulary the most notable word used is "abomination" in place of the human term reanimate. These are further divided into the slow (One), Fast (Two), and Hard (Three) with no sub-type divisions. Citizens are rather less focused on the question of if type fours and fives exist, but will refer to these as unknown or mystery abominations.

Otherwise there is:
Carapace: Human Power Armor (they refer to the Ekaide by name of course)
Defense Spire: Laser Tower
Rolling Fortress: Tanks or other heavy vehicles