derivational

German is a language that makes extensive use of derivational synthesis to build new words.

Now, with these words I cannot do what was done with the word strength, I cannot take from them the part which I look upon as the derivational addition, and after that leave an independent word.

V. According to the number of the derivational elements.—In fisher, as compared with fish, there is but one derivational affix.

In fishery, as compared with fish, the number of derivational elements is two.

Yet, as the fact of a word being sometimes used as a derivational addition does not preclude it from being at other times a part of the root, the evidence that the words in question are not simple, but derived, is not cogent.