A Dictionary of Catechisms from Puritan, Reformed, and several other denominations, such as Baptists, Broadus, Gadsby, Owen, etc.
Hitchcock’s Bible Names Dictionary (1869) gives the meaning of names in the Bible from the original languages as well as other information.
Trench’s Classic work, Synonyms of the New Testament, is a study of Greek synonyms in the New Testament, showing their similarities and differences.
Green Greek English Lexicon
This is an old dictionary of Christianity in which a lot of unused (in modern speech) terms are defined. Over 1500 entries.
A Manual Greek Lexicon of the New Testament + Keyed to Strong’s.
Hebrew/Greek Synonym Dictionary is a dictionary module showing the Hebrew to English or Greek to English root words.
Wuest Dictionary
This is an older work of only 57 entries, a lot of Old Testament Concepts.
Heresies of the Church Thru the Ages