| The following table gives the primitive spelling of all J words. Verbs are denoted by normal typeface, giving the monad first, followed by the dyad. Cunjunctions are denoted by bold typeface and adverbs are shown in bold italic typeface. | ||
| BARE | DOT | COLON |
| = Self-Classify - Equal | =. Is (Local) | =: Is (Global) |
| < Box - Less Than | <. Floor - Lesser of | <: Decrem - Less Or Eq |
| > Open - Larger Than | >. Ceiling - Larger of | >: Increm - Larg Or Eq |
| _ Negative Sign /Infinity | _. Indeterminate | _: Infinity |
| + Conjugate - Plus | +. Real/Imag - GCD (Or) | +: Double - Not-Or |
| * Signum - Times | *. Len/Angle - LCM (And) | *: Square - Not-And |
| - Negate - Minus | -. Not - Less | -: Halve - Match |
| % Reciprocal - Divided by | %. Matrix Inv - Mat Divide | %: Square Root - Root |
| ^ Exponential - Power | ^. Natural Log - Logarithm | ^: Power |
| $ Shape Of - Shape | $. | $: Self-Reference |
| ~ Reflex-Pass-EVOKE | ~. Nub | ~: Nub Sieve - Not-Eq |
| | Magnitude - Residue | |. Reverse - Rotate (Shift) | |: Transpose |
| . Det - Dot Product | .. Even | .: Odd |
| : Explicit - Monad/Dyad | :. Obverse | :: Adverse |
| , Ravel - Append | ,. Ravel Items - Stitch | ,: Itemize - Laminate |
| ; Raze - Link | ;. Cut | ;: Word formation |
| # Tally - Copy | #. Base 2 - Base | #: Antibase 2 - Antib |
| ! Factorial - Out Of | !. Fit (Customize) | !: Foreign |
| / Insert-Table-INSERT | /. Oblique-Key-APPEND | /: Grade Up - Sort |
| \ Prefix-Infix-TRAIN | \. Suffix - Outfix | \: Grade Down - Sort |
| [ Same - Left | [. Lev | [: Cap |
| ] Same - Right | ]. Dex | ]: Identity |
| { Catalogue - From | {. Head - Take | {: Tail |
| } Item Amend - Amend | }. Behead - Drop | }: Curtail |
| " Rank - CONSTANT | ". Do | ": Format |
| ` Tie (Gerund) | `. | `: Evoke Gerund |
| @ Atop | @. Agenda | @: At |
| & Bond /Compose | &. Under (Dual) | &: Appose |
| ? Roll - Deal | ?. Roll - Deal (fixed seed) | ?: |
| Special Words | ||
| a. Alphabet | a: Ace (boxed empty) | A. Atomic Permute |
| b. Boolean/Basic | c. Characteristic values | C. Cycle-Dir - Perm |
| D. Derivative | D: Secant Slope | e. Raze In - Memb |
| E. - Member of Interval | f. Fix | H. Hypergeometric |
| i. Integer - Index Of | j. Imaginary - Complex | L. L: Level, Level |
| NB. Comment | o. Pi Times - Circular | p. Polynomial |
| p: Prime | q: Prime Factors | r. Angle - Polar |
| t. Taylor coef | t: Wgtd Taylor Coef | T. Taylor Function |
| _9: to 9: Constant functions | x: Extended Precision | |