It will help you to expand your Portuguese vocabulary if you remember that many Portuguese words are similar in meaning and appearance to English words.
Noun: "discrete, meaningful unit of language which is approved by some authority"
1991, Some Questions about Language: A Theory of Human DiscourseISBN0812691784:
If a physical notation is […] not be found in the dictionary of any language, […] it will not be a word.
Noun: "sequence of letters or characters, or sounds (which does not necessarily have meaning)"
1913, Frederick William Hall, A companion to classical texts, page 155:
A meaningless word like tetera for cetera (owing to the similarity of c and t in rustic capitals) is bound to arrest the attention of the reader, however careless he be, and is soon corrected by conjecture or by comparison with other copies.