Standard works are done by many men, not just a few. These men work both independently and collectively to produce a translation in which tendencies toward independent prejudice of meaning have been neutralized by counter opinion within the group. Thus, both common man and Greek and Hebrew language scholars have reliable access to the words and meaning as presented by the original writers. Private translations are those Bibles or testaments produced by comparatively small groups of men or by individuals. Avoid these translations because of a general tendency for them to promote the translator's personal bias or the doctrines of his particular denomination.
Topical Bibles are arrangements of scripture in order of subject.
Although they are very useful, they must be used cautiously since they are subject to the same error as are private Bible translations, -that of bias due to the prejudice of the editor. Concordances are alphabetical listings of most of the words used in the Bible. Each word is listed in its order or occurrence in the Bible and each is displayed with enough of the wording with which it is used that identification of usage and context can be made. Topical studies can easily be developed using concordances, and particular scriptures whose wording is but partially remembered can be located. Dictionaries are, as you know, alphabetical listings of words.