See also GIS Terms (a fuller list)
General GIS Terms
Azimuth
Contour
Coordinate System
Coordinate System: Lat-Long
Coordinate System: SPCS
Coordinate System: UTM
Coordinate System: Web Mercator
Data: Feature Class
Data: Feature Dataset
Data: Grid
Data: LIDAR
Data: Raster
Data: Shapefile
Data: TIN
Data: Vector
Datum
Datum: NAD 27
Datum: NAD 83
Datum: WGS 84
Ellipsoid
Geo-Data-Viz
Geoid
GPS
Graticule
Grid
Latitude
Longitude
Magnetic Declination
Meridian
PLSS
Projection
Projection: Mercator
Projection: Web Mercator
Scale
Scale: Ratio
Scale: Representative Fraction
Scale: Scalebar
Slope
Spheroid (Oblate)
Stats: Min, Max, Mean, Mode, Median…
Z-Factor (elevation)
Types of MAPS
Maps: Basemap
Maps: Bathymetric
Maps: Cadastral
Maps: Cartogram
Maps: Choropleth
Maps: Dasymetric
Maps: Floorshade
Maps: General Reference
Maps: Hillshade
Maps: Hydrographic
Maps: Hydrology
Maps: Hypsometric
Maps: Isopleth or Isoline
Maps: Mono-Thematic
Maps: Multi-Directional Hillshade
Maps: Orthophotograph / Orthophoto
Maps: Relief
Maps: Swiss Hillshade
Maps: Thematic (single topic)
Maps: Topographic
SYMBOLOGY
Symbology: Bivariate Colors
Symbology: Classification Method: Defined
Symbology: Classification Method: Equal Interval
Symbology: Classification Method: Manual
Symbology: Classification Method: Natural Breaks
Symbology: Classification Method: Quantile
Symbology: Dot Density
Symbology: Graduated Colors
Symbology: Graduated Symbols
Symbology: Heat Map
Symbology: Hypsometric Shading
Symbology: Monochromatic
Symbology: Proportional Symbols
Symbology: Qualitative
Symbology: Quantitative
Symbology: Stop-Light-Cartography
Symbology: Unclassed Symbols
Symbology: Unique Values
TEXT
Text: ArcGIS: Annotation
Text: ArcGIS: Arcade
Text: ArcGIS: Graphic Text
Text: ArcGIS: Knockouts
Text: ArcGIS: Label Classes
Text: ArcGIS: Labels
Text: ArcGIS: Page Text
Text: Font
Text: Font: Case
Text: Font: Sans-Serif
Text: Font: Serif
Text: Font: Style
COLOR
Color Model
Color Model: CMYK
Color Model: HSV
Color Model: RGB
Color Scheme: ArcGIS
Color Scheme: ArcGIS: Bivariate
Color Scheme: ArcGIS: Continuous
Color Scheme: ArcGIS: Discrete
Color Scheme: ArcGIS: Multi-Part
Color Scheme: ArcGIS: Random
Color: ArcGIS: Layer Blend Modes
Color: Hexadecimal
Color: Simultaneous Contrast
Color: Vignettes (coastal or otherwise)
INTERACTIVE MAPS
ArcGIS Online: Basemap
ArcGIS Online: Operational Layers
ArcGIS Online: StoryMap
ArcGIS Online: Visible Scale Range
ArcGIS Online: Web Map
ArcGIS Online: Web Mapping Application