Of course all of them are Indo-European languages but my question is that which ones have more common Indo-European-origin words?
For example about pronouns, the first person plural pronoun in Germanic and Indo-Iranian languages is from proto-IE *wéy (Compare English we and Avestan wae but Latin nōs and Welsh ni) or the second person plural pronoun in Germanic and Indo-Iranian languages is from proto-IE *yū- (Compare English you and Avestan yuž but Latin vos and Cornish why).
I can list numerous words, for example compare proto-Germanic *yera and Avestan yārə to Italo-Celtic words for "year" or Germanic *austra and Avestan ušastra to Italo-Celtic words for "east", ...
About Indo-European s-mobile: https://en.wikipedia.org/wiki/Indo-European_s-mobile
Is Avestan a Germanic language?! It seems to be clear that proto-Germanic is colser to Indo-Iranian languages.
For example about pronouns, the first person plural pronoun in Germanic and Indo-Iranian languages is from proto-IE *wéy (Compare English we and Avestan wae but Latin nōs and Welsh ni) or the second person plural pronoun in Germanic and Indo-Iranian languages is from proto-IE *yū- (Compare English you and Avestan yuž but Latin vos and Cornish why).
I can list numerous words, for example compare proto-Germanic *yera and Avestan yārə to Italo-Celtic words for "year" or Germanic *austra and Avestan ušastra to Italo-Celtic words for "east", ...
About Indo-European s-mobile: https://en.wikipedia.org/wiki/Indo-European_s-mobile
This "movable" prefix s- appears at the beginning of some Indo-European roots, but is absent from other occurrences of the same root. For example, the stem *(s)táwros, perhaps 'bison', gives Latin taurus and Old English steor (Modern English steer), both meaning 'bull'. Both variants existed side by side in PIE, with Germanic preserving the forms as *steuraz and *þeuraz respectively, but Italic, Celtic, Slavic and others all have words for 'bull' which reflect the root without the s. Compare also: Gothic stiur, German Stier, Avestan staora (cattle); but Old Norse þjórr, Greek tauros, Latin taurus, Old Church Slavonic turъ, Lithuanian tauras, Welsh tarw, Old Irish tarb, Oscan turuf and Albanian taroç.
Is Avestan a Germanic language?! It seems to be clear that proto-Germanic is colser to Indo-Iranian languages.