Letters that make crossing over
s, o, e, g, n, c, r, i, v are letters that make 'crossing over'
Words within crossing over
ER, CRO, os, OS, si, OV, Ross, ng, Cross, Ro, SI, SS, cross, over, in, crossing, sin, IN, Sin, Cr, Er, In, Os, Si, sing are words within 'crossing over'