Dog:
Etymology: Origin unknown.
The word belongs to a set of words of uncertain or phonologically problematic etymology with a stem-final geminated g in Old English which is not due to West Germanic consonant gemination and therefore does not undergo assibilation. These words form both a morphological and a semantic group, as they are usually Old English weak masculine nouns and denote animals; compare frog n.1, hog n.1, pig n.1, stag n.1, Old English sugga (see haysugge n.), Old English wicga (see earwig n.), and perhaps teg n. It has been suggested that these words show expressive gemination, perhaps due to their being originally hypocoristic forms. (For discussion see R. M. Hogg ‘Two Geminate Consonants in Old English’ in J. Anderson Lang. Form & Ling. Variation (1982) 187–202.) For some of the words, substratal influence has also been considered (compare pig n.1). Because attestation of these words in Old English is generally rare and confined to glossaries and onomastic evidence (as in the case of dog n.1), if they are attested at all, and also because there is often a better-attested synonym (in this case, hound n.1), it seems likely that the words were stylistically marked in Old English, i.e. considered non-literary or informal.
Witch
Pronunciation: /wɪtʃ/
Forms: OE–ME wicce, wycce, ME–15 wicche, ME wichche, ME wychche, ME wycche, ME–15 wiche, ME ... (Show More)
Etymology: Old English wicce (feminine), corresponding to wicca witch n.1, both of which are apparently derivatives of wiccian witch v.1(Show Less)
1.
a. A female magician, sorceress; in later use esp. a woman supposed to have dealings with the devil or evil spirits and to be able by their co-operation to perform supernatural acts. See also white witch n.
Wizard:
Pronunciation: /ˈwɪzəd/
Forms: ME wys(e)ard, -sar, 15 -sarde, -zard, wyssarde, wissard, Sc. weser, 15–16 wisard... (Show More)
Etymology: late Middle English wysar(d, < wys, wis, wiss, wise adj. + -ard suffix. The pronunciation with voiced s (z) follows wisdom and wise