Does a letter fit inside the other?
Python 2, 135 130 129 bytes

-1 byte thanks to Lynn



lambda s:cmp(*s)%2*s[::cmp(*s)|1]in'OIH TIE XI7 RF O8 OGC LI0 O3 O96 VA O6 KI PI WI L1 WMI O0 RIB NI1 FE SOC VID ZIFB1 PF LE1 RP'


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Python 3, 143 bytes



lambda*i:any({*i}&amp;{a,c}=={*i}for a,b in zip('CFGILMPSVW013689','GO BEPR O 017BDEFHKLMNOPRTVWXZ E W R O A M O BEL O 9O O 6O'.split())for c in b)


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