Words and art could be inseparable and they are mutually related. For an artist, he/she needs a language to expain his or her art. Hence, language is very much related to art, especially when it come to interpretation and analysis.

I think an essential reference come from Josef Kosuth. According to Rosalind Krauss: " Joseph Kosuth in "Art After Philosophy" said that the art for thinking to itself must be rebuilt as language and as proposition. " and "Since analytic philosophy avoided every metaphysic consideration, the philosophy moved in the everyday language. According to Kosuth, art emerges from this condition, so art depends on its reconfiguration as language." I guess this can help.

Kosuth is fundamental. Another point of view: "W.J.T. Mitchell's 1994 Ut Pictura Theoria: Abstract Painting and Language, argues against Greenberg's conception of purity. According to Mitchell, representational and abstract painting both have a dependence on language, the former always involves narrative"

http://csmt.uchicago.edu/glossary2004/specificity.htm

language = art  = signs = language

It all depends on the level on which languages engage with one another

(in which signs engage with each other)

for example palimpsest  (signs cross over )

Different styles of painting within the same picture could also be called merged languages.

(Example in: "les demoiselles d' Avignon", Pablo Picasso