Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
English plain
English plein (mention)
English plaine (alter)
English (alter)
English obsolete (alter)
English plain text (mention)
English no-frills (link)
English simple (link)
English unadorned (link)
English unseasoned (link)
English monochrome (link)
English normal (link)
English ordinary (link)
English blatant (link)
English ostensible (link)
English consarn (link)
English darned (link)
English stinking (link)
English frank (link)
English sincere (link)
English bells and whistles (link)
English decorative (link)
English exotic (link)
English fancy (link)
English ornate (link)
English plane (link)
English planar (link)
English plein (alter)
English llano (doublet)
English grassland (mention)
English flatland (mention)
English plains (mention)
Middle English pleyn (inherited)
Middle French plain (borrowed)
Old French playn (mention)
Old French plain (derived)
Old French pleiner (mention)
Old French pleindre (derived)
Old French plaindre (mention)
Old French plain (derived)
Proto-Indo-European *pleh₂- (root)

English plane (mention)
English plane (link)
English bare (link)
English express (link)
English esplanade (mention)
English plainly (suffix)
English peneplain (prefix)
English floodplain (compound)
English plainspoken (compound)
English plainsong (affix)
English gibber plain (mention)
English plainness (suffix)
English plain and simple (compound)
English plainchant (compound)
English plainclothed (compound)
English plainswoman (affix)
English plainland (compound)
English plainlike (compound)
English plainish (suffix)
English plain flour (mention)
English plain work (compound)
English plainant (mention)
English plain dealer (mention)
English plainware (affix)
English plainsies (suffix)
English sandplain (compound)
English plainsawn (compound)
English riverplain (compound)
English plainful (suffix)
English plainful (suffix)
English plainhead (compound)
English paleoplain (prefix)
English etchplain (compound)
English palaeoplain (prefix)
Welsh plaen (borrowed)
Danish val (link)
Danish slet (link)
Lower Sorbian pólo (mention)
Old French plain (link)
Japanese プレーン (borrowed)
Japanese プレイン (borrowed)
Latin planus (link)
Norwegian Bokmål plen (derived)
Norwegian Bokmål skjær (link)
Dutch plein (cognate)
Norwegian Nynorsk plen (derived)
Polish pole (cognate)
Portuguese chada (link)