Ответ:

Nouns: relationship, scientist, structure, researcher, observation, influence, invention, development, production, television, communication, computer, temperature, producer, dictation.

Adjectives: mathematical, systematic, general, scientific, natural, social, technical, numerous, industrial, different, digital, physical, international, electric, electronic.

Adverbs: experimentally, closely, generally.

b) research, researcher, experimentally, experimental, experimenter, closely, closer, invention, searcher.