1.  allegory(n = noun.communication) apologue, fable, parable - a short moral story (often with animal characters);
is a kind of story
has particulars: aesop's fables, pilgrim's progress
Derived forms adjective allegorical₁, verb allegorise₂, verb allegorise₁, verb allegorize₂, verb allegorize₁

2.  allegory(n = noun.communication) emblem - a visible symbol representing an abstract idea;
is a kind of symbol, symbolic representation, symbolisation, symbolization
has particulars: scarlet letter, cupid, donkey, dove, eagle, elephant, fasces, ensign, national flag, hammer and sickle, red flag, magen david, mogen david, shield of david, solomon's seal, star of david, badge, agnus dei, paschal lamb, maple-leaf, medallion, spread eagle, hakenkreuz, swastika
Derived forms adjective allegorical₁, verb allegorise₂, verb allegorise₁, verb allegorize₂, verb allegorize₁

3.  allegory(n = noun.communication) - an expressive style that uses fictional characters and events to describe some subject by suggestive resemblances; an extended metaphor;
is a kind of expressive style, style
Derived forms adjective allegoric₁, adjective allegorical₁, verb allegorise₂, verb allegorise₁, verb allegorize₂, verb allegorize₁

1.  A figurative sentence or discourse, in which the principal subject is described by another subject resembling it in its properties and circumstances. The real subject is thus kept out of view, and we are left to collect the intentions of the writer or speaker by the resemblance of the secondary to the primary subject. [1913 Webster]

2.  Anything which represents by suggestive resemblance; an emblem. [1913 Webster]

3.  A figure representation which has a meaning beyond notion directly conveyed by the object painted or sculptured. [1913 Webster]
"An allegory is a prolonged metaphor. Bunyan's “Pilgrim's Progress” and Spenser's “Faërie Queene” are celebrated examples of the allegory." [1913 Webster]

allegory, n. (pl. -ies)
1 a story, play, poem, picture, etc., in which the meaning or message is represented symbolically.
2 the use of such symbols.
3 a symbol.

Derivative:
allegorist n.

Etymology:
ME f. OF allegorie f. L allegoria f. Gk allegoria f. allos other + -agoria speaking

N  comparison, collation, contrast, identification, comparative estimate, relative estimate, relativity, simile, similitude, analogy (similarity), allegory, matching, pattern-matching, ratio, proportion (number), discrimination, indiscrimination, identification, comparative, metaphorical, compared with, comparable, judged by comparison, relatively, as compared with, comparisons are odious, comparisons are odorous.

N  metaphor, figure of speech, facon de parler, way of speaking, colloquialism, phrase, figure, trope, metaphor, enallage, catachresis, metonymy, synecdoche, autonomasia, irony, figurativeness, image, imagery, metalepsis, type, anagoge, simile, personification, prosopopoeia, allegory, apologue, parable, fable, allusion, adumbration, application, exaggeration, hyperbole, association, association of ideas (analogy), metaphorical, figurative, catachrestical, typical, tralatitious, parabolic, allegorical, allusive, anagogical, ironical, colloquial, tropical, so to speak, so to say, so to express oneself, as it were, mutato nomine de te fabula narratur.