1.  similitude(n = noun.attribute) alikeness, likeness - similarity in appearance or character or nature between persons or things; "man created God in his own likeness"
is a kind of similarity
has particulars: comparability, compare, comparison, equivalence, mirror image, reflection, reflexion, naturalness, resemblance, spitting image
Antonym: dissimilitude

2.  similitude(n = noun.artifact) counterpart, twin - a duplicate copy; Array
is a kind of duplicate, duplication

1.  The quality or state of being similar or like; resemblance; likeness; similarity; as, similitude of substance. Chaucer. [1913 Webster]
"Let us make now man in our image, man
In our similitude." [1913 Webster]
"If fate some future bard shall join
In sad similitude of griefs to mine." [1913 Webster]

2.  The act of likening, or that which likens, one thing to another; fanciful or imaginative comparison; a simile. [1913 Webster]
"Tasso, in his similitudes, never departed from the woods; that is, all his comparisons were taken from the country." [1913 Webster]

3.  That which is like or similar; a representation, semblance, or copy; a facsimile. [1913 Webster]
"Man should wed his similitude." [1913 Webster]

similitude, n.
1 the likeness, guise, or outward appearance of a thing or person.
2 a comparison or the expression of a comparison.
3 archaic a counterpart or facsimile.

Etymology:
ME f. OF similitude or L similitudo (as SIMILE)

N  similarity, resemblance, likeness, similitude, semblance, affinity, approximation, parallelism, agreement, analogy, analogicalness, correspondence, homoiousia, parity, connaturalness, connaturality, brotherhood, family likeness, alliteration, rhyme, pun, repetition, sameness, uniformity, isogamy, analogue, the like, match, pendant, fellow companion, pair, mate, twin, double, counterpart, brother, sister, one's second self, alter ego, chip of the old block, par nobile fratrum, Arcades ambo, birds of a feather, et hoc genus omne, gens de meme famille, parallel, simile, type, image, photograph, close resemblance, striking resemblance, speaking resemblance, faithful likeness, faithful resemblance, similar, resembling, like, alike, twin, analogous, analogical, parallel, of a piece, such as, so, homoiousian, connatural, congener, allied to, akin to, approximate, much the same, near, close, something like, sort of, in the ballpark, such like, a show of, mock, pseudo, simulating, representing, exact, lifelike, faithful, true to nature, true to life, the very image, the very picture of, for all the world like, comme deux gouttes d'eau, as like as two peas in a pod, as like as it can stare, instar omnium, cast in the same mold, ridiculously like, as if, so to speak, as it were, as if it were, quasi, just as, veluti in speculum, et sic de similibus, tel maitre tel valet, tel pere tel fils, like master, like servant, like father, like son, the fruit doesn't fall far from the tree, a chip off the old block.

N  copy, facsimile, counterpart, effigies, effigy, form, likeness, image, picture, photo, xerox, similitude, semblance, ectype, photo offset, electrotype, imitation, model, representation, adumbration, study, portrait, resemblance, duplicate, reproduction, cast, tracing, reflex, reflexion, reflection, shadow, echo, transcript, transcription, recording, scan, chip off the old block, reprint, new printing, rechauffe, apograph, fair copy, parody, caricature, burlesque, travesty, travestie, paraphrase, derivative, derivation, modification, expansion, extension, revision, second edition, servile copy, servile imitation, plagiarism, counterfeit, fake, pasticcio, faithful, lifelike, close, conscientious, unoriginal, imitative, derivative.

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.