Little words

or

Source:*iliProto-Slavic · “or (*i + *li)”probable

Russian and BCS share или/ili; Ukrainian, Polish and Czech build 'or' with bo, though the exact make-up of або and albo is debated.

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English

Polish

albo

ˈalbɔ

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In all five languages

BCS script

Latin under Cyrillic

Russian
и́лиili
ˈilʲiinherited
Ukrainian
або́abo
aˈbɔdifferent word · particles а + бо 'for' (cf. Polish albo)
Polish
albo
ˈalbɔdifferent word · Old Polish, built from small particles ending in bo 'for'
Lub is the formal alternative.
Czech
nebo
ˈnɛbodifferent word · particles ne + bo 'for'
Bosnian-Croatian-Serbian
iliили
ˈiliinherited
English
or