The journey of the Sanskrit words taru तरु and druma द्रुम drumá, both meaning a tree.

 

The Sanskrit word taru तरु  meaning a tree became Hittite taru (tree, timber), Middle English tre, Old English trēo/trēow meaning a tree and hence wood;

Old Frisian trē, Old Saxon treo or trio, Gothic triu, Old Norse trē; Old Irish daur,

Irish darach, darog, Gaulic darach, dār/deri (dery), deru, derow, Welsh dār/deri, derw,

Breton derō, all meaning an oak or oak-timber ; Lithuanian  dervà, pine-wood; Albanian dru, a tree; Greek doru, a wooden beam or shaft or spear, and drus, a tree; Persian daraKHt दरख़्त meaning a tree.

The following English words also originates from Sanskrit word taru तरु: 

TAR (a dark, thick flammable liquid distilled from wood or coal), TRAY, TRIG (in good condition, strong),TRIM, TROUGH (in the meaning of straight or direct i.e. she walked through the doorway into the living room), TRUE/TRUTH, TRUG (a shallow oblong basket made of strips of wood, traditionally used for carrying garden flowers and produce),  dryad, dryas, hamadryad and DURABLE.

 

Sanskrit druma द्रुम, drumá, a tree became Greek doru, a tree, especially the oak, Greek drus, a tree, druas, a wood nymph, form-adopted and sense-adapted becomes Greek druas/druades and Latin dryas/dryads and dryadem, Middle French dry ade, English dryad;

The Greek Hamadruas, plural Hamadruades (Greek hama, along with, together with ) meaning special wood nymphs with lives depending upon the trees to which they are attached, becomes Latin Hamadryas, Hamadryadem, French hamadryade and English hamadryad.