before vowels log-, word-forming element meaning "speech, word," also "reason," from Greek logos "word, discourse; reason," from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')."
word-forming element meaning "excessive or irrational fear, horror, or aversion," from Latin -phobia and directly from Greek -phobia "panic fear of," from phobos "fear" (see phobia). In widespread popular use with native words from c. 1800. In psychology, "an abnormal or irrational fear." Related: -phobic.
<a href="https://www.etymonline.com/word/logophobia">Etymology of logophobia by etymonline</a>
Harper, D. (n.d.). Etymology of logophobia. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/logophobia