“RERIGS” is a valid word. — 7 points Scrabble

risea growth in strength or number or importance
sirea title of address formerly used for a man of rank and authority
rigsgear (including necessary machinery) for a particular enterprise
regs
reisany rational or irrational number
errsto make a mistake or be incorrect
gies
iresa strong emotion; a feeling that is oriented toward some real or supposed grievance
ergsa cgs unit of work or energy; the work done by a force of one dyne acting over a distance of one centimeter
egisarmor plate that protects the chest; the front part of a cuirass

sirterm of address for a man
riggear (including necessary machinery) for a particular enterprise
reg
errto make a mistake or be incorrect
sri
ser
rei
resa widely distributed system consisting of all the cells able to ingest bacteria or colloidal particles etc, except for certain white blood cells
sei
gie
irea strong emotion; a feeling that is oriented toward some real or supposed grievance
ers
seg
erga cgs unit of work or energy; the work done by a force of one dyne acting over a distance of one centimeter

ishave the quality of being; (copula, used with an adjective or a predicate noun)
era trivalent metallic element of the rare earth group; occurs with yttrium
rea rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum
sia tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
esa radioactive transuranic element produced by bombarding plutonium with neutrons

RERIGS