vlaselmo'i lujvo

x1=v1=s1 is a word/set of words (able to be) recalled by x2=s2 about subject x3=s3; x1 is the vocabulary retrieved by x2.

From valsi selmo'i, 'word(s)-remembered'. An attempt at translating the English word 'vocabulary'. Pedantically, refers only to the words actually remembered, rather than those that are merely retrievable. vlamojyzilcmi ('word-remember-set') is a potentially more accurate translation of the English word.

In notes:

x1=z1=m2 [set] is the vocabulary remembered/used/retrievable by x2=m1 about subject x3=m3; x1 are the words x2 can recall about x3.