Adolescence /ˌæd

vocabulary /vəˈkæb.jʊ.l ə r.i/ /voʊˈkæb.jə.ler-/ noun
1. [ C ] all the words known and used by a particular person
a wide/limited vocabulary
By the age of two a child will have a vocabulary of about two hundred words.
2. [ C or U ] all the words which exist in a particular language or subject
Every week our French teacher gives us a list of vocabulary (= words) to learn.
Computing, like any subject, has its own vocabulary.
incoherent /ˌɪn.kə ʊ  ˈhɪə.rənt/ /-koʊˈhɪr. ə nt/ adjective
1. expressing yourself in a way that is not clear
He was confused and incoherent and I didn't get much sense out of him.
2. expressed in a way that is not clear, especially with words or ideas that are joined together badly
The talk she gave was incoherent and badly prepared.