People

neighbour

Source:*sǫsědъProto-Slavic · “one who sits alongside”certain

A sound-law sampler: nasal ǫ (Polish są-), jat (і, ia, e, je), and Czech ú → ou.

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English

neighbour

Polish

sąsiad

ˈsɔ̃ɕat

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In all five languages

BCS script

Latin under Cyrillic

Russian
сосе́дsosed
sɐˈsʲetinherited
Old Russian had сусѣдъ; the о is a later change.
Ukrainian
сусі́дsusid
suˈsʲidinherited
Polish
sąsiad
ˈsɔ̃ɕatinherited
Czech
soused
ˈsou̯sɛtinherited
Bosnian-Croatian-Serbian
susjed / susedсусјед / сусед
ˈsusjedinherited
English
neighbour