English Proficiency Programme
Etymologically connected words
Root: species (n)
species (n), speciate (v), speciation (n), specimen (n);
specific (adj), specify(v), specification (n), specifically (adv);
..., ..., ...;
..., ..., ...;
special-ly (adj, adv), specialise (v), specialisation (n), specialist (n).
Another neighbouring tree is related to "speech".