I've decided to pick something which may be a tad more representative, and at the same time it shows up some problems. For one, I selected only three words comparison, namely iron, silver and gold. For the sake of making the map not too crammed, I dumped all the Romance languages in favour of just Latin. For the sake of completeness, here's the summary of the Romance languages:
Portuguese - Spanish - Catalonian - French - Italian - Romanian
Ferro - Hierro - Ferro - Fer - Ferro - Fier
Prata - Plata - Plata - Argent - Argento - Argint
Ouro - Oro - Or - Or - Oro - Aur
Otherwise, here's the languages I used (note that the list both includes extant and extinct):
Celtic languages:
- Irish
- Welsh
- Breton
- Gaulish (note that the word for gold is, to my knowledge, unattested, it can however be reconstructed with reasonable safety as "Auron").
Germanic languages:
- English
- Dutch
- German
- Danish
- Norwegian
- Swedish
- Gothic
Slavic languages:
- Czech
- Polish
- Croatian
- Bulgarian
- Russian
- Ukrainian
Other IE languages:
- Latvian
- Lithuanian
- Latin
- Albanian
- Greek
- Hittite (note that Hittite had no word for iron)
Non-IE languages:
- Basque
- Finnish
What is very interesting here is this:
- in regard for gold and silver, Germanic uses the same root word as Baltic and Slavic (in common Balto-Slavic, G was rendered Z, hence "Zelta" vs. "Gold"). The Finnish word for "gold" apparently seems also be a cognate with Germanic.
- The Germanic words for iron are derived from Celtic "Isarnos" (in fact, I was amazed how similar Gothic "Isarn" is to Gaulish "Isarnos"!), which makes perfect sense since the Germanic people adopted iron working from the Celtic Hallstatt Culture.
- Celtic, Latin, Greek and Albanian use the same root word for silver. It must be added that Albanian may have borrowed the word from Latin.
- Basque, Celtic, Latin and Albanian apparently use the same root word for gold.
- What is very interesting is the Basque word for "iron" (Burdina), which raises the question, where did they get their iron from?
- What is very unfortunate is that I couldn't find Etruscan or Dacian words for any of the three.
EDIT: I should add that technically, this does not belong into genetics but linguistics...